chore: regens API reference docs (#889)

diff --git a/docs/dyn/compute_alpha.instanceGroupManagers.html b/docs/dyn/compute_alpha.instanceGroupManagers.html
index bd5b753..b1ff012 100644
--- a/docs/dyn/compute_alpha.instanceGroupManagers.html
+++ b/docs/dyn/compute_alpha.instanceGroupManagers.html
@@ -75,52 +75,52 @@
 <h1><a href="compute_alpha.html">Compute Engine API</a> . <a href="compute_alpha.instanceGroupManagers.html">instanceGroupManagers</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#abandonInstances">abandonInstances(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#abandonInstances">abandonInstances(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Flags the specified instances to be removed from the managed instance group. Abandoning an instance does not delete the instance, but it does remove the instance from any target pools that are applied by the managed instance group. This method reduces the targetSize of the managed instance group by the number of instances that you abandon. This operation is marked as DONE when the action is scheduled even if the instances have not yet been removed from the group. You must separately verify the status of the abandoning action with the listmanagedinstances method.</p>
 <p class="toc_element">
-  <code><a href="#aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, returnPartialSuccess=None, filter=None, includeAllScopes=None)</a></code></p>
 <p class="firstline">Retrieves the list of managed instance groups and groups them by zone.</p>
 <p class="toc_element">
   <code><a href="#aggregatedList_next">aggregatedList_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#applyUpdatesToInstances">applyUpdatesToInstances(project, zone, instanceGroupManager, body)</a></code></p>
-<p class="firstline">Apply changes to selected instances on the managed instance group. This method can be used to apply new overrides and/or new versions.</p>
+  <code><a href="#applyUpdatesToInstances">applyUpdatesToInstances(project, zone, instanceGroupManager, body=None)</a></code></p>
+<p class="firstline">Applies changes to selected instances on the managed instance group. This method can be used to apply new overrides and/or new versions.</p>
 <p class="toc_element">
-  <code><a href="#createInstances">createInstances(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#createInstances">createInstances(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Creates instances with per-instance configs in this managed instance group. Instances are created using the current instance template. The create instances operation is marked DONE if the createInstances request is successful. The underlying actions take additional time. You must separately verify the status of the creating or actions with the listmanagedinstances method.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(project, zone, instanceGroupManager, requestId=None)</a></code></p>
 <p class="firstline">Deletes the specified managed instance group and all of the instances in that group. Note that the instance group must not belong to a backend service. Read  Deleting an instance group for more information.</p>
 <p class="toc_element">
-  <code><a href="#deleteInstances">deleteInstances(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#deleteInstances">deleteInstances(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Flags the specified instances in the managed instance group for immediate deletion. The instances are also removed from any target pools of which they were a member. This method reduces the targetSize of the managed instance group by the number of instances that you delete. This operation is marked as DONE when the action is scheduled even if the instances are still being deleted. You must separately verify the status of the deleting action with the listmanagedinstances method.</p>
 <p class="toc_element">
-  <code><a href="#deletePerInstanceConfigs">deletePerInstanceConfigs(project, zone, instanceGroupManager, body)</a></code></p>
+  <code><a href="#deletePerInstanceConfigs">deletePerInstanceConfigs(project, zone, instanceGroupManager, body=None)</a></code></p>
 <p class="firstline">Deletes selected per-instance configs for the managed instance group.</p>
 <p class="toc_element">
   <code><a href="#get">get(project, zone, instanceGroupManager)</a></code></p>
 <p class="firstline">Returns all of the details about the specified managed instance group. Gets a list of available managed instance groups by making a list() request.</p>
 <p class="toc_element">
-  <code><a href="#insert">insert(project, zone, body, requestId=None)</a></code></p>
+  <code><a href="#insert">insert(project, zone, body=None, requestId=None)</a></code></p>
 <p class="firstline">Creates a managed instance group using the information that you specify in the request. After the group is created, instances in the group are created using the specified instance template. This operation is marked as DONE when the group is created even if the instances in the group have not yet been created. You must separately verify the status of the individual instances with the listmanagedinstances method.</p>
 <p class="toc_element">
-  <code><a href="#list">list(project, zone, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#list">list(project, zone, orderBy=None, pageToken=None, maxResults=None, returnPartialSuccess=None, filter=None)</a></code></p>
 <p class="firstline">Retrieves a list of managed instance groups that are contained within the specified project and zone.</p>
 <p class="toc_element">
-  <code><a href="#listErrors">listErrors(project, zone, instanceGroupManager, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#listErrors">listErrors(project, zone, instanceGroupManager, orderBy=None, pageToken=None, maxResults=None, returnPartialSuccess=None, filter=None)</a></code></p>
 <p class="firstline">Lists all errors thrown by actions on instances for a given managed instance group.</p>
 <p class="toc_element">
   <code><a href="#listErrors_next">listErrors_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#listManagedInstances">listManagedInstances(project, zone, instanceGroupManager, order_by=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#listManagedInstances">listManagedInstances(project, zone, instanceGroupManager, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
 <p class="firstline">Lists all of the instances in the managed instance group. Each instance in the list has a currentAction, which indicates the action that the managed instance group is performing on the instance. For example, if the group is still creating an instance, the currentAction is CREATING. If a previous action failed, the list displays the errors for that failed action.</p>
 <p class="toc_element">
   <code><a href="#listManagedInstances_next">listManagedInstances_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#listPerInstanceConfigs">listPerInstanceConfigs(project, zone, instanceGroupManager, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#listPerInstanceConfigs">listPerInstanceConfigs(project, zone, instanceGroupManager, orderBy=None, pageToken=None, maxResults=None, returnPartialSuccess=None, filter=None)</a></code></p>
 <p class="firstline">Lists all of the per-instance configs defined for the managed instance group.</p>
 <p class="toc_element">
   <code><a href="#listPerInstanceConfigs_next">listPerInstanceConfigs_next(previous_request, previous_response)</a></code></p>
@@ -129,41 +129,41 @@
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#patch">patch(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#patch">patch(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Updates a managed instance group using the information that you specify in the request. This operation is marked as DONE when the group is patched even if the instances in the group are still in the process of being patched. You must separately verify the status of the individual instances with the listManagedInstances method. This method supports PATCH semantics and uses the JSON merge patch format and processing rules.</p>
 <p class="toc_element">
-  <code><a href="#patchPerInstanceConfigs">patchPerInstanceConfigs(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
-<p class="firstline">Insert or patch (for the ones that already exist) per-instance configs for the managed instance group. perInstanceConfig.instance serves as a key used to distinguish whether to perform insert or patch.</p>
+  <code><a href="#patchPerInstanceConfigs">patchPerInstanceConfigs(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
+<p class="firstline">Inserts or patches per-instance configs for the managed instance group. perInstanceConfig.name serves as a key used to distinguish whether to perform insert or patch.</p>
 <p class="toc_element">
-  <code><a href="#recreateInstances">recreateInstances(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#recreateInstances">recreateInstances(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Flags the specified instances in the managed instance group to be immediately recreated. The instances are deleted and recreated using the current instance template for the managed instance group. This operation is marked as DONE when the flag is set even if the instances have not yet been recreated. You must separately verify the status of the recreating action with the listmanagedinstances method.</p>
 <p class="toc_element">
   <code><a href="#resize">resize(project, zone, instanceGroupManager, size, requestId=None)</a></code></p>
 <p class="firstline">Resizes the managed instance group. If you increase the size, the group creates new instances using the current instance template. If you decrease the size, the group deletes instances. The resize operation is marked DONE when the resize actions are scheduled even if the group has not yet added or deleted any instances. You must separately verify the status of the creating or deleting actions with the listmanagedinstances method.</p>
 <p class="toc_element">
-  <code><a href="#resizeAdvanced">resizeAdvanced(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#resizeAdvanced">resizeAdvanced(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Resizes the managed instance group with advanced configuration options like disabling creation retries. This is an extended version of the resize method.</p>
 <p class="toc_element">
-  <code><a href="#setAutoHealingPolicies">setAutoHealingPolicies(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#setAutoHealingPolicies">setAutoHealingPolicies(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Modifies the autohealing policies. [Deprecated] This method is deprecated. Please use Patch instead.</p>
 <p class="toc_element">
-  <code><a href="#setInstanceTemplate">setInstanceTemplate(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#setInstanceTemplate">setInstanceTemplate(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Specifies the instance template to use when creating new instances in this group. The templates for existing instances in the group do not change unless you recreate them.</p>
 <p class="toc_element">
-  <code><a href="#setTargetPools">setTargetPools(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#setTargetPools">setTargetPools(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Modifies the target pools to which all instances in this managed instance group are assigned. The target pools automatically apply to all of the instances in the managed instance group. This operation is marked DONE when you make the request even if the instances have not yet been added to their target pools. The change might take some time to apply to all of the instances in the group depending on the size of the group.</p>
 <p class="toc_element">
-  <code><a href="#testIamPermissions">testIamPermissions(project, zone, resource, body)</a></code></p>
+  <code><a href="#testIamPermissions">testIamPermissions(project, zone, resource, body=None)</a></code></p>
 <p class="firstline">Returns permissions that a caller has on the specified resource.</p>
 <p class="toc_element">
-  <code><a href="#update">update(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
+  <code><a href="#update">update(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
 <p class="firstline">Updates a managed instance group using the information that you specify in the request. This operation is marked as DONE when the group is updated even if the instances in the group have not yet been updated. You must separately verify the status of the individual instances with the listManagedInstances method.</p>
 <p class="toc_element">
-  <code><a href="#updatePerInstanceConfigs">updatePerInstanceConfigs(project, zone, instanceGroupManager, body, requestId=None)</a></code></p>
-<p class="firstline">Insert or update (for the ones that already exist) per-instance configs for the managed instance group. perInstanceConfig.instance serves as a key used to distinguish whether to perform insert or patch.</p>
+  <code><a href="#updatePerInstanceConfigs">updatePerInstanceConfigs(project, zone, instanceGroupManager, body=None, requestId=None)</a></code></p>
+<p class="firstline">Inserts or updates per-instance configs for the managed instance group. perInstanceConfig.name serves as a key used to distinguish whether to perform insert or patch.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="abandonInstances">abandonInstances(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="abandonInstances">abandonInstances(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Flags the specified instances to be removed from the managed instance group. Abandoning an instance does not delete the instance, but it does remove the instance from any target pools that are applied by the managed instance group. This method reduces the targetSize of the managed instance group by the number of instances that you abandon. This operation is marked as DONE when the action is scheduled even if the instances have not yet been removed from the group. You must separately verify the status of the abandoning action with the listmanagedinstances method.
 
 If the group is part of a backend service that has enabled connection draining, it can take up to 60 seconds after the connection draining duration has elapsed before the VM instance is removed or deleted.
@@ -174,7 +174,7 @@
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -194,26 +194,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -229,10 +233,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -250,25 +254,27 @@
 </div>
 
 <div class="method">
-    <code class="details" id="aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, returnPartialSuccess=None, filter=None, includeAllScopes=None)</code>
   <pre>Retrieves the list of managed instance groups and groups them by zone.
 
 Args:
   project: string, Project ID for this request. (required)
   orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  returnPartialSuccess: boolean, Opt-in for partial success behavior which provides partial results in case of failure. The default value is false and the logic is the same as today.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
+  includeAllScopes: boolean, Indicates whether every visible scope for each scope type (zone, region, global) should be included in the response. For new resource types added after this field, the flag has no effect as new resource types will always include every visible scope for each scope type in response. For resource types which predate this field, if this flag is omitted or false, only scopes of the scope types where the resource type is expected to be found will be included.
 
 Returns:
   An object of the form:
@@ -296,7 +302,7 @@
               #
               # For zonal Managed Instance Group, use the instanceGroupManagers resource.
               #
-              # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for beta.instanceGroupManagers ==) (== resource_for v1.instanceGroupManagers ==) (== resource_for beta.regionInstanceGroupManagers ==) (== resource_for v1.regionInstanceGroupManagers ==)
+              # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for {$api_version}.instanceGroupManagers ==) (== resource_for {$api_version}.regionInstanceGroupManagers ==)
             "failoverAction": "A String", # The action to perform in case of zone failure. Only one value is supported, NO_FAILOVER. The default is NO_FAILOVER.
             "pendingActions": { # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The list of instance actions and the number of instances in this managed instance group that are pending for each of those actions.
               "recreating": 42, # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The number of instances in the managed instance group that are pending to be recreated.
@@ -323,7 +329,9 @@
                 "percent": 42, # Specifies a percentage of instances between 0 to 100%, inclusive. For example, specify 80 for 80%.
               },
               "minimalAction": "A String", # Minimal action to be taken on an instance. You can specify either RESTART to restart existing instances or REPLACE to delete and create new instances from the target template. If you specify a RESTART, the Updater will attempt to perform that action only. However, if the Updater determines that the minimal action you specify is not enough to perform the update, it might perform a more disruptive action.
-              "instanceRedistributionType": "A String",
+              "instanceRedistributionType": "A String", # The  instance redistribution policy for regional managed instance groups. Valid values are:
+                  # - PROACTIVE (default): The group attempts to maintain an even distribution of VM instances across zones in the region.
+                  # - NONE: For non-autoscaled groups, proactive redistribution is disabled.
               "maxUnavailable": { # Encapsulates numeric value that can be either absolute or relative. # The maximum number of instances that can be unavailable during the update process. An instance is considered available if all of the following conditions are satisfied:
                   #
                   #
@@ -353,12 +361,14 @@
             ],
             "status": { # [Output Only] The status of this managed instance group.
               "stateful": { # [Output Only] Stateful status of the given Instance Group Manager.
-                "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group is stateful, i.e. has any disks in Stateful Policy or at least one per-instance config. This is determined based on the user intent, the group may be reported as not stateful even when there is still some preserved state on managed instances.
+                "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions. This field is deprecated in favor of has_stateful_config.
+                "hasStatefulConfig": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions.
               },
               "isStable": True or False, # [Output Only] A bit indicating whether the managed instance group is in a stable state. A stable state means that: none of the instances in the managed instance group is currently undergoing any type of change (for example, creation, restart, or deletion); no future changes are scheduled for instances in the managed instance group; and the managed instance group itself is not being modified.
               "versionTarget": { # [Output Only] A status of consistency of Instances' versions with their target version specified by version field on Instance Group Manager.
                 "isReached": True or False, # [Output Only] A bit indicating whether version target has been reached in this managed instance group, i.e. all instances are in their target version. Instances' target version are specified by version field on Instance Group Manager.
               },
+              "autoscaler": "A String", # [Output Only] The URL of the Autoscaler that targets this instance group manager.
             },
             "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
             "autoHealingPolicies": [ # The autohealing policy for this managed instance group. You can specify only one value.
@@ -420,22 +430,16 @@
               },
             ],
             "region": "A String", # [Output Only] The URL of the region where the managed instance group resides (for regional resources).
-            "targetSize": 42, # The target number of running instances for this managed instance group. Deleting or abandoning instances reduces this number. Resizing the group changes this number.
+            "targetSize": 42, # The target number of running instances for this managed instance group. You can reduce this number by using the instanceGroupManager deleteInstances or abandonInstances methods. Resizing the group also changes this number.
             "distributionPolicy": { # Policy specifying intended distribution of instances in regional managed instance group.
               "zones": [ # Zones where the regional managed instance group will create and manage instances.
                 {
                   "zone": "A String", # The URL of the zone. The zone must exist in the region where the managed instance group is located.
                 },
               ],
+              "targetShape": "A String", # The shape to which the group converges either proactively or on resize events (depending on the value set in updatePolicy.instanceRedistributionType). The possible values are EVEN and ANY. For EVEN the group attempts to preserve a balanced number of instances across zones. For ANY the group creates new instances where resources are available to fulfill the request; as a result, instances may be distributed unevenly across zones in this mode. The default value is EVEN.
             },
             "statefulPolicy": { # Stateful configuration for this Instanced Group Manager
-              "preservedResources": { # Configuration of all preserved resources.
-                "disks": [ # Disks created on the instances that will be preserved on instance delete, resize down, etc.
-                  {
-                    "deviceName": "A String", # Device name of the disk to be preserved
-                  },
-                ],
-              },
               "preservedState": { # Configuration of preserved resources.
                 "disks": { # Disks created on the instances that will be preserved on instance delete, update, etc. This map is keyed with the device names of the disks.
                   "a_key": {
@@ -460,6 +464,9 @@
         },
       ],
     },
+    "unreachables": [ # [Output Only] Unreachable resources.
+      "A String",
+    ],
     "id": "A String", # [Output Only] Unique identifier for the resource; defined by the server.
     "selfLink": "A String", # [Output Only] Server-defined URL for this resource.
   }</pre>
@@ -480,14 +487,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="applyUpdatesToInstances">applyUpdatesToInstances(project, zone, instanceGroupManager, body)</code>
-  <pre>Apply changes to selected instances on the managed instance group. This method can be used to apply new overrides and/or new versions.
+    <code class="details" id="applyUpdatesToInstances">applyUpdatesToInstances(project, zone, instanceGroupManager, body=None)</code>
+  <pre>Applies changes to selected instances on the managed instance group. This method can be used to apply new overrides and/or new versions.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. Should conform to RFC1035. (required)
   instanceGroupManager: string, The name of the managed instance group, should conform to RFC1035. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # InstanceGroupManagers.applyUpdatesToInstances
@@ -513,26 +520,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -548,10 +559,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -569,38 +580,21 @@
 </div>
 
 <div class="method">
-    <code class="details" id="createInstances">createInstances(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="createInstances">createInstances(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Creates instances with per-instance configs in this managed instance group. Instances are created using the current instance template. The create instances operation is marked DONE if the createInstances request is successful. The underlying actions take additional time. You must separately verify the status of the creating or actions with the listmanagedinstances method.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. It should conform to RFC1035. (required)
   instanceGroupManager: string, The name of the managed instance group. It should conform to RFC1035. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # InstanceGroupManagers.createInstances
     "instances": [ # [Required] List of specifications of per-instance configs.
       {
-        "override": { # Overrides of stateful properties for a given instance
-          "origin": "A String", # [Output Only] Indicates where does the override come from.
-          "disks": [ # Disk overrides defined for this instance. According to documentation the maximum number of disks attached to an instance is 128: https://cloud.google.com/compute/docs/disks/ However, compute API defines the limit at 140, so this is what we check.
-            {
-              "deviceName": "A String", # The name of the device on the VM
-              "mode": "A String", # The mode in which to attach this disk, either READ_WRITE or READ_ONLY. If not specified, the default is to attach the disk in READ_WRITE mode.
-              "source": "A String", # The disk that is/will be mounted
-            },
-          ],
-          "metadata": [ # Metadata overrides defined for this instance. TODO(b/69785416) validate the total length is <9 KB
-            {
-              "value": "A String", # Value for the metadata entry. These are free-form strings, and only have meaning as interpreted by the image running in the instance. The only restriction placed on values is that their size must be less than or equal to 262144 bytes (256 KiB).
-              "key": "A String", # Key for the metadata entry. Keys must conform to the following regexp: [a-zA-Z0-9-_]+, and be less than 128 bytes in length. This is reflected as part of a URL in the metadata server. Additionally, to avoid ambiguity, keys must not conflict with any other metadata keys for the project.
-            },
-          ],
-        },
-        "instance": "A String", # The URL of the instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same instance URL exists then it will be updated, otherwise a new one will be created.
-        "name": "A String", # The name of the per-instance config and the corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in a failure.
-        "preservedState": { # Preserved state for a given instance. # Intended preserved state for the given instance. Does not contain state generated based on Stateful Policy.
+        "name": "A String", # The name of a per-instance config and its corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operations, that is, if a per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in an error.
+        "preservedState": { # Preserved state for a given instance. # The intended preserved state for the given instance. Does not contain preserved state generated from a stateful policy.
           "disks": { # Preserved disks defined for this instance. This map is keyed with the device names of the disks.
             "a_key": {
               "source": "A String", # The URL of the disk resource that is stateful and should be attached to the VM instance.
@@ -612,7 +606,7 @@
             "a_key": "A String",
           },
         },
-        "fingerprint": "A String", # Fingerprint of this per-instance config. This field may be used in optimistic locking. It will be ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
+        "fingerprint": "A String", # Fingerprint of this per-instance config. This field can be used in optimistic locking. It is ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
       },
     ],
   }
@@ -628,26 +622,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -663,10 +661,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -702,26 +700,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -737,10 +739,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -758,7 +760,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="deleteInstances">deleteInstances(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="deleteInstances">deleteInstances(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Flags the specified instances in the managed instance group for immediate deletion. The instances are also removed from any target pools of which they were a member. This method reduces the targetSize of the managed instance group by the number of instances that you delete. This operation is marked as DONE when the action is scheduled even if the instances are still being deleted. You must separately verify the status of the deleting action with the listmanagedinstances method.
 
 If the group is part of a backend service that has enabled connection draining, it can take up to 60 seconds after the connection draining duration has elapsed before the VM instance is removed or deleted.
@@ -769,7 +771,7 @@
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -789,26 +791,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -824,10 +830,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -845,20 +851,17 @@
 </div>
 
 <div class="method">
-    <code class="details" id="deletePerInstanceConfigs">deletePerInstanceConfigs(project, zone, instanceGroupManager, body)</code>
+    <code class="details" id="deletePerInstanceConfigs">deletePerInstanceConfigs(project, zone, instanceGroupManager, body=None)</code>
   <pre>Deletes selected per-instance configs for the managed instance group.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. It should conform to RFC1035. (required)
   instanceGroupManager: string, The name of the managed instance group. It should conform to RFC1035. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # InstanceGroupManagers.deletePerInstanceConfigs
-    "instances": [ # The list of instances for which we want to delete per-instance configs on this managed instance group.
-      "A String",
-    ],
     "names": [ # The list of instance names for which we want to delete per-instance configs on this managed instance group.
       "A String",
     ],
@@ -870,26 +873,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -905,10 +912,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -943,7 +950,7 @@
       #
       # For zonal Managed Instance Group, use the instanceGroupManagers resource.
       #
-      # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for beta.instanceGroupManagers ==) (== resource_for v1.instanceGroupManagers ==) (== resource_for beta.regionInstanceGroupManagers ==) (== resource_for v1.regionInstanceGroupManagers ==)
+      # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for {$api_version}.instanceGroupManagers ==) (== resource_for {$api_version}.regionInstanceGroupManagers ==)
     "failoverAction": "A String", # The action to perform in case of zone failure. Only one value is supported, NO_FAILOVER. The default is NO_FAILOVER.
     "pendingActions": { # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The list of instance actions and the number of instances in this managed instance group that are pending for each of those actions.
       "recreating": 42, # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The number of instances in the managed instance group that are pending to be recreated.
@@ -970,7 +977,9 @@
         "percent": 42, # Specifies a percentage of instances between 0 to 100%, inclusive. For example, specify 80 for 80%.
       },
       "minimalAction": "A String", # Minimal action to be taken on an instance. You can specify either RESTART to restart existing instances or REPLACE to delete and create new instances from the target template. If you specify a RESTART, the Updater will attempt to perform that action only. However, if the Updater determines that the minimal action you specify is not enough to perform the update, it might perform a more disruptive action.
-      "instanceRedistributionType": "A String",
+      "instanceRedistributionType": "A String", # The  instance redistribution policy for regional managed instance groups. Valid values are:
+          # - PROACTIVE (default): The group attempts to maintain an even distribution of VM instances across zones in the region.
+          # - NONE: For non-autoscaled groups, proactive redistribution is disabled.
       "maxUnavailable": { # Encapsulates numeric value that can be either absolute or relative. # The maximum number of instances that can be unavailable during the update process. An instance is considered available if all of the following conditions are satisfied:
           #
           #
@@ -1000,12 +1009,14 @@
     ],
     "status": { # [Output Only] The status of this managed instance group.
       "stateful": { # [Output Only] Stateful status of the given Instance Group Manager.
-        "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group is stateful, i.e. has any disks in Stateful Policy or at least one per-instance config. This is determined based on the user intent, the group may be reported as not stateful even when there is still some preserved state on managed instances.
+        "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions. This field is deprecated in favor of has_stateful_config.
+        "hasStatefulConfig": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions.
       },
       "isStable": True or False, # [Output Only] A bit indicating whether the managed instance group is in a stable state. A stable state means that: none of the instances in the managed instance group is currently undergoing any type of change (for example, creation, restart, or deletion); no future changes are scheduled for instances in the managed instance group; and the managed instance group itself is not being modified.
       "versionTarget": { # [Output Only] A status of consistency of Instances' versions with their target version specified by version field on Instance Group Manager.
         "isReached": True or False, # [Output Only] A bit indicating whether version target has been reached in this managed instance group, i.e. all instances are in their target version. Instances' target version are specified by version field on Instance Group Manager.
       },
+      "autoscaler": "A String", # [Output Only] The URL of the Autoscaler that targets this instance group manager.
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "autoHealingPolicies": [ # The autohealing policy for this managed instance group. You can specify only one value.
@@ -1067,22 +1078,16 @@
       },
     ],
     "region": "A String", # [Output Only] The URL of the region where the managed instance group resides (for regional resources).
-    "targetSize": 42, # The target number of running instances for this managed instance group. Deleting or abandoning instances reduces this number. Resizing the group changes this number.
+    "targetSize": 42, # The target number of running instances for this managed instance group. You can reduce this number by using the instanceGroupManager deleteInstances or abandonInstances methods. Resizing the group also changes this number.
     "distributionPolicy": { # Policy specifying intended distribution of instances in regional managed instance group.
       "zones": [ # Zones where the regional managed instance group will create and manage instances.
         {
           "zone": "A String", # The URL of the zone. The zone must exist in the region where the managed instance group is located.
         },
       ],
+      "targetShape": "A String", # The shape to which the group converges either proactively or on resize events (depending on the value set in updatePolicy.instanceRedistributionType). The possible values are EVEN and ANY. For EVEN the group attempts to preserve a balanced number of instances across zones. For ANY the group creates new instances where resources are available to fulfill the request; as a result, instances may be distributed unevenly across zones in this mode. The default value is EVEN.
     },
     "statefulPolicy": { # Stateful configuration for this Instanced Group Manager
-      "preservedResources": { # Configuration of all preserved resources.
-        "disks": [ # Disks created on the instances that will be preserved on instance delete, resize down, etc.
-          {
-            "deviceName": "A String", # Device name of the disk to be preserved
-          },
-        ],
-      },
       "preservedState": { # Configuration of preserved resources.
         "disks": { # Disks created on the instances that will be preserved on instance delete, update, etc. This map is keyed with the device names of the disks.
           "a_key": {
@@ -1096,7 +1101,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="insert">insert(project, zone, body, requestId=None)</code>
+    <code class="details" id="insert">insert(project, zone, body=None, requestId=None)</code>
   <pre>Creates a managed instance group using the information that you specify in the request. After the group is created, instances in the group are created using the specified instance template. This operation is marked as DONE when the group is created even if the instances in the group have not yet been created. You must separately verify the status of the individual instances with the listmanagedinstances method.
 
 A managed instance group can have up to 1000 VM instances per group. Please contact Cloud Support if you need an increase in this limit.
@@ -1104,7 +1109,7 @@
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where you want to create the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Represents a Managed Instance Group resource.
@@ -1113,7 +1118,7 @@
     # 
     # For zonal Managed Instance Group, use the instanceGroupManagers resource.
     # 
-    # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for beta.instanceGroupManagers ==) (== resource_for v1.instanceGroupManagers ==) (== resource_for beta.regionInstanceGroupManagers ==) (== resource_for v1.regionInstanceGroupManagers ==)
+    # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for {$api_version}.instanceGroupManagers ==) (== resource_for {$api_version}.regionInstanceGroupManagers ==)
   "failoverAction": "A String", # The action to perform in case of zone failure. Only one value is supported, NO_FAILOVER. The default is NO_FAILOVER.
   "pendingActions": { # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The list of instance actions and the number of instances in this managed instance group that are pending for each of those actions.
     "recreating": 42, # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The number of instances in the managed instance group that are pending to be recreated.
@@ -1140,7 +1145,9 @@
       "percent": 42, # Specifies a percentage of instances between 0 to 100%, inclusive. For example, specify 80 for 80%.
     },
     "minimalAction": "A String", # Minimal action to be taken on an instance. You can specify either RESTART to restart existing instances or REPLACE to delete and create new instances from the target template. If you specify a RESTART, the Updater will attempt to perform that action only. However, if the Updater determines that the minimal action you specify is not enough to perform the update, it might perform a more disruptive action.
-    "instanceRedistributionType": "A String",
+    "instanceRedistributionType": "A String", # The  instance redistribution policy for regional managed instance groups. Valid values are:
+        # - PROACTIVE (default): The group attempts to maintain an even distribution of VM instances across zones in the region.
+        # - NONE: For non-autoscaled groups, proactive redistribution is disabled.
     "maxUnavailable": { # Encapsulates numeric value that can be either absolute or relative. # The maximum number of instances that can be unavailable during the update process. An instance is considered available if all of the following conditions are satisfied:
         #
         #
@@ -1170,12 +1177,14 @@
   ],
   "status": { # [Output Only] The status of this managed instance group.
     "stateful": { # [Output Only] Stateful status of the given Instance Group Manager.
-      "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group is stateful, i.e. has any disks in Stateful Policy or at least one per-instance config. This is determined based on the user intent, the group may be reported as not stateful even when there is still some preserved state on managed instances.
+      "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions. This field is deprecated in favor of has_stateful_config.
+      "hasStatefulConfig": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions.
     },
     "isStable": True or False, # [Output Only] A bit indicating whether the managed instance group is in a stable state. A stable state means that: none of the instances in the managed instance group is currently undergoing any type of change (for example, creation, restart, or deletion); no future changes are scheduled for instances in the managed instance group; and the managed instance group itself is not being modified.
     "versionTarget": { # [Output Only] A status of consistency of Instances' versions with their target version specified by version field on Instance Group Manager.
       "isReached": True or False, # [Output Only] A bit indicating whether version target has been reached in this managed instance group, i.e. all instances are in their target version. Instances' target version are specified by version field on Instance Group Manager.
     },
+    "autoscaler": "A String", # [Output Only] The URL of the Autoscaler that targets this instance group manager.
   },
   "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
   "autoHealingPolicies": [ # The autohealing policy for this managed instance group. You can specify only one value.
@@ -1237,22 +1246,16 @@
     },
   ],
   "region": "A String", # [Output Only] The URL of the region where the managed instance group resides (for regional resources).
-  "targetSize": 42, # The target number of running instances for this managed instance group. Deleting or abandoning instances reduces this number. Resizing the group changes this number.
+  "targetSize": 42, # The target number of running instances for this managed instance group. You can reduce this number by using the instanceGroupManager deleteInstances or abandonInstances methods. Resizing the group also changes this number.
   "distributionPolicy": { # Policy specifying intended distribution of instances in regional managed instance group.
     "zones": [ # Zones where the regional managed instance group will create and manage instances.
       {
         "zone": "A String", # The URL of the zone. The zone must exist in the region where the managed instance group is located.
       },
     ],
+    "targetShape": "A String", # The shape to which the group converges either proactively or on resize events (depending on the value set in updatePolicy.instanceRedistributionType). The possible values are EVEN and ANY. For EVEN the group attempts to preserve a balanced number of instances across zones. For ANY the group creates new instances where resources are available to fulfill the request; as a result, instances may be distributed unevenly across zones in this mode. The default value is EVEN.
   },
   "statefulPolicy": { # Stateful configuration for this Instanced Group Manager
-    "preservedResources": { # Configuration of all preserved resources.
-      "disks": [ # Disks created on the instances that will be preserved on instance delete, resize down, etc.
-        {
-          "deviceName": "A String", # Device name of the disk to be preserved
-        },
-      ],
-    },
     "preservedState": { # Configuration of preserved resources.
       "disks": { # Disks created on the instances that will be preserved on instance delete, update, etc. This map is keyed with the device names of the disks.
         "a_key": {
@@ -1275,26 +1278,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -1310,10 +1317,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -1331,7 +1338,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(project, zone, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="list">list(project, zone, orderBy=None, pageToken=None, maxResults=None, returnPartialSuccess=None, filter=None)</code>
   <pre>Retrieves a list of managed instance groups that are contained within the specified project and zone.
 
 Args:
@@ -1339,18 +1346,19 @@
   zone: string, The name of the zone where the managed instance group is located. (required)
   orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  returnPartialSuccess: boolean, Opt-in for partial success behavior which provides partial results in case of failure. The default value is false and the logic is the same as today.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
 
 Returns:
   An object of the form:
@@ -1365,7 +1373,7 @@
           #
           # For zonal Managed Instance Group, use the instanceGroupManagers resource.
           #
-          # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for beta.instanceGroupManagers ==) (== resource_for v1.instanceGroupManagers ==) (== resource_for beta.regionInstanceGroupManagers ==) (== resource_for v1.regionInstanceGroupManagers ==)
+          # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for {$api_version}.instanceGroupManagers ==) (== resource_for {$api_version}.regionInstanceGroupManagers ==)
         "failoverAction": "A String", # The action to perform in case of zone failure. Only one value is supported, NO_FAILOVER. The default is NO_FAILOVER.
         "pendingActions": { # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The list of instance actions and the number of instances in this managed instance group that are pending for each of those actions.
           "recreating": 42, # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The number of instances in the managed instance group that are pending to be recreated.
@@ -1392,7 +1400,9 @@
             "percent": 42, # Specifies a percentage of instances between 0 to 100%, inclusive. For example, specify 80 for 80%.
           },
           "minimalAction": "A String", # Minimal action to be taken on an instance. You can specify either RESTART to restart existing instances or REPLACE to delete and create new instances from the target template. If you specify a RESTART, the Updater will attempt to perform that action only. However, if the Updater determines that the minimal action you specify is not enough to perform the update, it might perform a more disruptive action.
-          "instanceRedistributionType": "A String",
+          "instanceRedistributionType": "A String", # The  instance redistribution policy for regional managed instance groups. Valid values are:
+              # - PROACTIVE (default): The group attempts to maintain an even distribution of VM instances across zones in the region.
+              # - NONE: For non-autoscaled groups, proactive redistribution is disabled.
           "maxUnavailable": { # Encapsulates numeric value that can be either absolute or relative. # The maximum number of instances that can be unavailable during the update process. An instance is considered available if all of the following conditions are satisfied:
               #
               #
@@ -1422,12 +1432,14 @@
         ],
         "status": { # [Output Only] The status of this managed instance group.
           "stateful": { # [Output Only] Stateful status of the given Instance Group Manager.
-            "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group is stateful, i.e. has any disks in Stateful Policy or at least one per-instance config. This is determined based on the user intent, the group may be reported as not stateful even when there is still some preserved state on managed instances.
+            "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions. This field is deprecated in favor of has_stateful_config.
+            "hasStatefulConfig": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions.
           },
           "isStable": True or False, # [Output Only] A bit indicating whether the managed instance group is in a stable state. A stable state means that: none of the instances in the managed instance group is currently undergoing any type of change (for example, creation, restart, or deletion); no future changes are scheduled for instances in the managed instance group; and the managed instance group itself is not being modified.
           "versionTarget": { # [Output Only] A status of consistency of Instances' versions with their target version specified by version field on Instance Group Manager.
             "isReached": True or False, # [Output Only] A bit indicating whether version target has been reached in this managed instance group, i.e. all instances are in their target version. Instances' target version are specified by version field on Instance Group Manager.
           },
+          "autoscaler": "A String", # [Output Only] The URL of the Autoscaler that targets this instance group manager.
         },
         "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
         "autoHealingPolicies": [ # The autohealing policy for this managed instance group. You can specify only one value.
@@ -1489,22 +1501,16 @@
           },
         ],
         "region": "A String", # [Output Only] The URL of the region where the managed instance group resides (for regional resources).
-        "targetSize": 42, # The target number of running instances for this managed instance group. Deleting or abandoning instances reduces this number. Resizing the group changes this number.
+        "targetSize": 42, # The target number of running instances for this managed instance group. You can reduce this number by using the instanceGroupManager deleteInstances or abandonInstances methods. Resizing the group also changes this number.
         "distributionPolicy": { # Policy specifying intended distribution of instances in regional managed instance group.
           "zones": [ # Zones where the regional managed instance group will create and manage instances.
             {
               "zone": "A String", # The URL of the zone. The zone must exist in the region where the managed instance group is located.
             },
           ],
+          "targetShape": "A String", # The shape to which the group converges either proactively or on resize events (depending on the value set in updatePolicy.instanceRedistributionType). The possible values are EVEN and ANY. For EVEN the group attempts to preserve a balanced number of instances across zones. For ANY the group creates new instances where resources are available to fulfill the request; as a result, instances may be distributed unevenly across zones in this mode. The default value is EVEN.
         },
         "statefulPolicy": { # Stateful configuration for this Instanced Group Manager
-          "preservedResources": { # Configuration of all preserved resources.
-            "disks": [ # Disks created on the instances that will be preserved on instance delete, resize down, etc.
-              {
-                "deviceName": "A String", # Device name of the disk to be preserved
-              },
-            ],
-          },
           "preservedState": { # Configuration of preserved resources.
             "disks": { # Disks created on the instances that will be preserved on instance delete, update, etc. This map is keyed with the device names of the disks.
               "a_key": {
@@ -1533,7 +1539,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="listErrors">listErrors(project, zone, instanceGroupManager, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="listErrors">listErrors(project, zone, instanceGroupManager, orderBy=None, pageToken=None, maxResults=None, returnPartialSuccess=None, filter=None)</code>
   <pre>Lists all errors thrown by actions on instances for a given managed instance group.
 
 Args:
@@ -1542,18 +1548,19 @@
   instanceGroupManager: string, The name of the managed instance group. It must be a string that meets the requirements in RFC1035, or an unsigned long integer: must match regexp pattern: (?:[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?)|[1-9][0-9]{0,19}. (required)
   orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  returnPartialSuccess: boolean, Opt-in for partial success behavior which provides partial results in case of failure. The default value is false and the logic is the same as today.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
 
 Returns:
   An object of the form:
@@ -1595,27 +1602,27 @@
 </div>
 
 <div class="method">
-    <code class="details" id="listManagedInstances">listManagedInstances(project, zone, instanceGroupManager, order_by=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="listManagedInstances">listManagedInstances(project, zone, instanceGroupManager, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
   <pre>Lists all of the instances in the managed instance group. Each instance in the list has a currentAction, which indicates the action that the managed instance group is performing on the instance. For example, if the group is still creating an instance, the currentAction is CREATING. If a previous action failed, the list displays the errors for that failed action.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  order_by: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
+  orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
 
 Returns:
   An object of the form:
@@ -1633,7 +1640,7 @@
           {
             "healthCheck": "A String", # [Output Only] The URL for the health check that verifies whether the instance is healthy.
             "detailedHealthState": "A String", # [Output Only] The current detailed instance health state.
-            "healthState": "A String", # [Output Only] The current instance health state.
+            "healthState": "A String", # [Output Only] The current instance health state. This field will not get promoted to beta/GA and might be removed from alpha APIs after 01/12/2019. Please use detailed_health_state field instead.
           },
         ],
         "lastAttempt": { # [Output Only] Information about the last attempt to create or delete the instance.
@@ -1662,22 +1669,6 @@
           },
         },
         "instanceTemplate": "A String", # [Output Only] The intended template of the instance. This field is empty when current_action is one of { DELETING, ABANDONING }.
-        "override": { # Overrides of stateful properties for a given instance # [Output Only] Override defined for this instance.
-          "origin": "A String", # [Output Only] Indicates where does the override come from.
-          "disks": [ # Disk overrides defined for this instance. According to documentation the maximum number of disks attached to an instance is 128: https://cloud.google.com/compute/docs/disks/ However, compute API defines the limit at 140, so this is what we check.
-            {
-              "deviceName": "A String", # The name of the device on the VM
-              "mode": "A String", # The mode in which to attach this disk, either READ_WRITE or READ_ONLY. If not specified, the default is to attach the disk in READ_WRITE mode.
-              "source": "A String", # The disk that is/will be mounted
-            },
-          ],
-          "metadata": [ # Metadata overrides defined for this instance. TODO(b/69785416) validate the total length is <9 KB
-            {
-              "value": "A String", # Value for the metadata entry. These are free-form strings, and only have meaning as interpreted by the image running in the instance. The only restriction placed on values is that their size must be less than or equal to 262144 bytes (256 KiB).
-              "key": "A String", # Key for the metadata entry. Keys must conform to the following regexp: [a-zA-Z0-9-_]+, and be less than 128 bytes in length. This is reflected as part of a URL in the metadata server. Additionally, to avoid ambiguity, keys must not conflict with any other metadata keys for the project.
-            },
-          ],
-        },
         "currentAction": "A String", # [Output Only] The current action that the managed instance group has scheduled for the instance. Possible values:
             # - NONE The instance is running, and the managed instance group does not have any scheduled actions for this instance.
             # - CREATING The managed instance group is creating this instance. If the group fails to create this instance, it will try again until it is successful.
@@ -1721,7 +1712,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="listPerInstanceConfigs">listPerInstanceConfigs(project, zone, instanceGroupManager, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="listPerInstanceConfigs">listPerInstanceConfigs(project, zone, instanceGroupManager, orderBy=None, pageToken=None, maxResults=None, returnPartialSuccess=None, filter=None)</code>
   <pre>Lists all of the per-instance configs defined for the managed instance group.
 
 Args:
@@ -1730,18 +1721,19 @@
   instanceGroupManager: string, The name of the managed instance group. It should conform to RFC1035. (required)
   orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  returnPartialSuccess: boolean, Opt-in for partial success behavior which provides partial results in case of failure. The default value is false and the logic is the same as today.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
 
 Returns:
   An object of the form:
@@ -1750,25 +1742,8 @@
     "nextPageToken": "A String", # [Output Only] This token allows you to get the next page of results for list requests. If the number of results is larger than maxResults, use the nextPageToken as a value for the query parameter pageToken in the next list request. Subsequent list requests will have their own nextPageToken to continue paging through the results.
     "items": [ # [Output Only] The list of PerInstanceConfig.
       {
-        "override": { # Overrides of stateful properties for a given instance
-          "origin": "A String", # [Output Only] Indicates where does the override come from.
-          "disks": [ # Disk overrides defined for this instance. According to documentation the maximum number of disks attached to an instance is 128: https://cloud.google.com/compute/docs/disks/ However, compute API defines the limit at 140, so this is what we check.
-            {
-              "deviceName": "A String", # The name of the device on the VM
-              "mode": "A String", # The mode in which to attach this disk, either READ_WRITE or READ_ONLY. If not specified, the default is to attach the disk in READ_WRITE mode.
-              "source": "A String", # The disk that is/will be mounted
-            },
-          ],
-          "metadata": [ # Metadata overrides defined for this instance. TODO(b/69785416) validate the total length is <9 KB
-            {
-              "value": "A String", # Value for the metadata entry. These are free-form strings, and only have meaning as interpreted by the image running in the instance. The only restriction placed on values is that their size must be less than or equal to 262144 bytes (256 KiB).
-              "key": "A String", # Key for the metadata entry. Keys must conform to the following regexp: [a-zA-Z0-9-_]+, and be less than 128 bytes in length. This is reflected as part of a URL in the metadata server. Additionally, to avoid ambiguity, keys must not conflict with any other metadata keys for the project.
-            },
-          ],
-        },
-        "instance": "A String", # The URL of the instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same instance URL exists then it will be updated, otherwise a new one will be created.
-        "name": "A String", # The name of the per-instance config and the corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in a failure.
-        "preservedState": { # Preserved state for a given instance. # Intended preserved state for the given instance. Does not contain state generated based on Stateful Policy.
+        "name": "A String", # The name of a per-instance config and its corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operations, that is, if a per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in an error.
+        "preservedState": { # Preserved state for a given instance. # The intended preserved state for the given instance. Does not contain preserved state generated from a stateful policy.
           "disks": { # Preserved disks defined for this instance. This map is keyed with the device names of the disks.
             "a_key": {
               "source": "A String", # The URL of the disk resource that is stateful and should be attached to the VM instance.
@@ -1780,7 +1755,7 @@
             "a_key": "A String",
           },
         },
-        "fingerprint": "A String", # Fingerprint of this per-instance config. This field may be used in optimistic locking. It will be ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
+        "fingerprint": "A String", # Fingerprint of this per-instance config. This field can be used in optimistic locking. It is ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
       },
     ],
     "warning": { # [Output Only] Informational warning message.
@@ -1826,14 +1801,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="patch">patch(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="patch">patch(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Updates a managed instance group using the information that you specify in the request. This operation is marked as DONE when the group is patched even if the instances in the group are still in the process of being patched. You must separately verify the status of the individual instances with the listManagedInstances method. This method supports PATCH semantics and uses the JSON merge patch format and processing rules.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where you want to create the managed instance group. (required)
   instanceGroupManager: string, The name of the instance group manager. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Represents a Managed Instance Group resource.
@@ -1842,7 +1817,7 @@
     # 
     # For zonal Managed Instance Group, use the instanceGroupManagers resource.
     # 
-    # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for beta.instanceGroupManagers ==) (== resource_for v1.instanceGroupManagers ==) (== resource_for beta.regionInstanceGroupManagers ==) (== resource_for v1.regionInstanceGroupManagers ==)
+    # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for {$api_version}.instanceGroupManagers ==) (== resource_for {$api_version}.regionInstanceGroupManagers ==)
   "failoverAction": "A String", # The action to perform in case of zone failure. Only one value is supported, NO_FAILOVER. The default is NO_FAILOVER.
   "pendingActions": { # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The list of instance actions and the number of instances in this managed instance group that are pending for each of those actions.
     "recreating": 42, # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The number of instances in the managed instance group that are pending to be recreated.
@@ -1869,7 +1844,9 @@
       "percent": 42, # Specifies a percentage of instances between 0 to 100%, inclusive. For example, specify 80 for 80%.
     },
     "minimalAction": "A String", # Minimal action to be taken on an instance. You can specify either RESTART to restart existing instances or REPLACE to delete and create new instances from the target template. If you specify a RESTART, the Updater will attempt to perform that action only. However, if the Updater determines that the minimal action you specify is not enough to perform the update, it might perform a more disruptive action.
-    "instanceRedistributionType": "A String",
+    "instanceRedistributionType": "A String", # The  instance redistribution policy for regional managed instance groups. Valid values are:
+        # - PROACTIVE (default): The group attempts to maintain an even distribution of VM instances across zones in the region.
+        # - NONE: For non-autoscaled groups, proactive redistribution is disabled.
     "maxUnavailable": { # Encapsulates numeric value that can be either absolute or relative. # The maximum number of instances that can be unavailable during the update process. An instance is considered available if all of the following conditions are satisfied:
         #
         #
@@ -1899,12 +1876,14 @@
   ],
   "status": { # [Output Only] The status of this managed instance group.
     "stateful": { # [Output Only] Stateful status of the given Instance Group Manager.
-      "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group is stateful, i.e. has any disks in Stateful Policy or at least one per-instance config. This is determined based on the user intent, the group may be reported as not stateful even when there is still some preserved state on managed instances.
+      "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions. This field is deprecated in favor of has_stateful_config.
+      "hasStatefulConfig": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions.
     },
     "isStable": True or False, # [Output Only] A bit indicating whether the managed instance group is in a stable state. A stable state means that: none of the instances in the managed instance group is currently undergoing any type of change (for example, creation, restart, or deletion); no future changes are scheduled for instances in the managed instance group; and the managed instance group itself is not being modified.
     "versionTarget": { # [Output Only] A status of consistency of Instances' versions with their target version specified by version field on Instance Group Manager.
       "isReached": True or False, # [Output Only] A bit indicating whether version target has been reached in this managed instance group, i.e. all instances are in their target version. Instances' target version are specified by version field on Instance Group Manager.
     },
+    "autoscaler": "A String", # [Output Only] The URL of the Autoscaler that targets this instance group manager.
   },
   "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
   "autoHealingPolicies": [ # The autohealing policy for this managed instance group. You can specify only one value.
@@ -1966,22 +1945,16 @@
     },
   ],
   "region": "A String", # [Output Only] The URL of the region where the managed instance group resides (for regional resources).
-  "targetSize": 42, # The target number of running instances for this managed instance group. Deleting or abandoning instances reduces this number. Resizing the group changes this number.
+  "targetSize": 42, # The target number of running instances for this managed instance group. You can reduce this number by using the instanceGroupManager deleteInstances or abandonInstances methods. Resizing the group also changes this number.
   "distributionPolicy": { # Policy specifying intended distribution of instances in regional managed instance group.
     "zones": [ # Zones where the regional managed instance group will create and manage instances.
       {
         "zone": "A String", # The URL of the zone. The zone must exist in the region where the managed instance group is located.
       },
     ],
+    "targetShape": "A String", # The shape to which the group converges either proactively or on resize events (depending on the value set in updatePolicy.instanceRedistributionType). The possible values are EVEN and ANY. For EVEN the group attempts to preserve a balanced number of instances across zones. For ANY the group creates new instances where resources are available to fulfill the request; as a result, instances may be distributed unevenly across zones in this mode. The default value is EVEN.
   },
   "statefulPolicy": { # Stateful configuration for this Instanced Group Manager
-    "preservedResources": { # Configuration of all preserved resources.
-      "disks": [ # Disks created on the instances that will be preserved on instance delete, resize down, etc.
-        {
-          "deviceName": "A String", # Device name of the disk to be preserved
-        },
-      ],
-    },
     "preservedState": { # Configuration of preserved resources.
       "disks": { # Disks created on the instances that will be preserved on instance delete, update, etc. This map is keyed with the device names of the disks.
         "a_key": {
@@ -2004,26 +1977,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2039,10 +2016,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2060,38 +2037,21 @@
 </div>
 
 <div class="method">
-    <code class="details" id="patchPerInstanceConfigs">patchPerInstanceConfigs(project, zone, instanceGroupManager, body, requestId=None)</code>
-  <pre>Insert or patch (for the ones that already exist) per-instance configs for the managed instance group. perInstanceConfig.instance serves as a key used to distinguish whether to perform insert or patch.
+    <code class="details" id="patchPerInstanceConfigs">patchPerInstanceConfigs(project, zone, instanceGroupManager, body=None, requestId=None)</code>
+  <pre>Inserts or patches per-instance configs for the managed instance group. perInstanceConfig.name serves as a key used to distinguish whether to perform insert or patch.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. It should conform to RFC1035. (required)
   instanceGroupManager: string, The name of the managed instance group. It should conform to RFC1035. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # InstanceGroupManagers.patchPerInstanceConfigs
     "perInstanceConfigs": [ # The list of per-instance configs to insert or patch on this managed instance group.
       {
-        "override": { # Overrides of stateful properties for a given instance
-          "origin": "A String", # [Output Only] Indicates where does the override come from.
-          "disks": [ # Disk overrides defined for this instance. According to documentation the maximum number of disks attached to an instance is 128: https://cloud.google.com/compute/docs/disks/ However, compute API defines the limit at 140, so this is what we check.
-            {
-              "deviceName": "A String", # The name of the device on the VM
-              "mode": "A String", # The mode in which to attach this disk, either READ_WRITE or READ_ONLY. If not specified, the default is to attach the disk in READ_WRITE mode.
-              "source": "A String", # The disk that is/will be mounted
-            },
-          ],
-          "metadata": [ # Metadata overrides defined for this instance. TODO(b/69785416) validate the total length is <9 KB
-            {
-              "value": "A String", # Value for the metadata entry. These are free-form strings, and only have meaning as interpreted by the image running in the instance. The only restriction placed on values is that their size must be less than or equal to 262144 bytes (256 KiB).
-              "key": "A String", # Key for the metadata entry. Keys must conform to the following regexp: [a-zA-Z0-9-_]+, and be less than 128 bytes in length. This is reflected as part of a URL in the metadata server. Additionally, to avoid ambiguity, keys must not conflict with any other metadata keys for the project.
-            },
-          ],
-        },
-        "instance": "A String", # The URL of the instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same instance URL exists then it will be updated, otherwise a new one will be created.
-        "name": "A String", # The name of the per-instance config and the corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in a failure.
-        "preservedState": { # Preserved state for a given instance. # Intended preserved state for the given instance. Does not contain state generated based on Stateful Policy.
+        "name": "A String", # The name of a per-instance config and its corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operations, that is, if a per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in an error.
+        "preservedState": { # Preserved state for a given instance. # The intended preserved state for the given instance. Does not contain preserved state generated from a stateful policy.
           "disks": { # Preserved disks defined for this instance. This map is keyed with the device names of the disks.
             "a_key": {
               "source": "A String", # The URL of the disk resource that is stateful and should be attached to the VM instance.
@@ -2103,7 +2063,7 @@
             "a_key": "A String",
           },
         },
-        "fingerprint": "A String", # Fingerprint of this per-instance config. This field may be used in optimistic locking. It will be ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
+        "fingerprint": "A String", # Fingerprint of this per-instance config. This field can be used in optimistic locking. It is ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
       },
     ],
   }
@@ -2119,26 +2079,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2154,10 +2118,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2175,7 +2139,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="recreateInstances">recreateInstances(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="recreateInstances">recreateInstances(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Flags the specified instances in the managed instance group to be immediately recreated. The instances are deleted and recreated using the current instance template for the managed instance group. This operation is marked as DONE when the flag is set even if the instances have not yet been recreated. You must separately verify the status of the recreating action with the listmanagedinstances method.
 
 If the group is part of a backend service that has enabled connection draining, it can take up to 60 seconds after the connection draining duration has elapsed before the VM instance is removed or deleted.
@@ -2186,7 +2150,7 @@
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -2206,26 +2170,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2241,10 +2209,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2289,26 +2257,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2324,10 +2296,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2345,7 +2317,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="resizeAdvanced">resizeAdvanced(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="resizeAdvanced">resizeAdvanced(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Resizes the managed instance group with advanced configuration options like disabling creation retries. This is an extended version of the resize method.
 
 If you increase the size of the instance group, the group creates new instances using the current instance template. If you decrease the size, the group deletes instances. The resize operation is marked DONE when the resize actions are scheduled even if the group has not yet added or deleted any instances. You must separately verify the status of the creating, creatingWithoutRetries, or deleting actions with the get or listmanagedinstances method.
@@ -2356,7 +2328,7 @@
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -2381,26 +2353,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2416,10 +2392,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2437,14 +2413,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="setAutoHealingPolicies">setAutoHealingPolicies(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="setAutoHealingPolicies">setAutoHealingPolicies(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Modifies the autohealing policies. [Deprecated] This method is deprecated. Please use Patch instead.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the instance group manager. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -2478,26 +2454,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2513,10 +2493,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2534,14 +2514,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="setInstanceTemplate">setInstanceTemplate(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="setInstanceTemplate">setInstanceTemplate(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Specifies the instance template to use when creating new instances in this group. The templates for existing instances in the group do not change unless you recreate them.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -2559,26 +2539,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2594,10 +2578,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2615,14 +2599,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="setTargetPools">setTargetPools(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="setTargetPools">setTargetPools(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Modifies the target pools to which all instances in this managed instance group are assigned. The target pools automatically apply to all of the instances in the managed instance group. This operation is marked DONE when you make the request even if the instances have not yet been added to their target pools. The change might take some time to apply to all of the instances in the group depending on the size of the group.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. (required)
   instanceGroupManager: string, The name of the managed instance group. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -2643,26 +2627,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2678,10 +2666,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2699,14 +2687,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="testIamPermissions">testIamPermissions(project, zone, resource, body)</code>
+    <code class="details" id="testIamPermissions">testIamPermissions(project, zone, resource, body=None)</code>
   <pre>Returns permissions that a caller has on the specified resource.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone for this request. (required)
   resource: string, Name or id of the resource for this request. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -2727,14 +2715,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(project, zone, instanceGroupManager, body, requestId=None)</code>
+    <code class="details" id="update">update(project, zone, instanceGroupManager, body=None, requestId=None)</code>
   <pre>Updates a managed instance group using the information that you specify in the request. This operation is marked as DONE when the group is updated even if the instances in the group have not yet been updated. You must separately verify the status of the individual instances with the listManagedInstances method.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where you want to create the managed instance group. (required)
   instanceGroupManager: string, The name of the instance group manager. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Represents a Managed Instance Group resource.
@@ -2743,7 +2731,7 @@
     # 
     # For zonal Managed Instance Group, use the instanceGroupManagers resource.
     # 
-    # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for beta.instanceGroupManagers ==) (== resource_for v1.instanceGroupManagers ==) (== resource_for beta.regionInstanceGroupManagers ==) (== resource_for v1.regionInstanceGroupManagers ==)
+    # For regional Managed Instance Group, use the regionInstanceGroupManagers resource. (== resource_for {$api_version}.instanceGroupManagers ==) (== resource_for {$api_version}.regionInstanceGroupManagers ==)
   "failoverAction": "A String", # The action to perform in case of zone failure. Only one value is supported, NO_FAILOVER. The default is NO_FAILOVER.
   "pendingActions": { # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The list of instance actions and the number of instances in this managed instance group that are pending for each of those actions.
     "recreating": 42, # [Deprecated] This field is deprecated and will be removed. Prefer using the status field instead. Please contact cloud-updater-feedback@google.com to leave feedback if your workload relies on this field. [Output Only] The number of instances in the managed instance group that are pending to be recreated.
@@ -2770,7 +2758,9 @@
       "percent": 42, # Specifies a percentage of instances between 0 to 100%, inclusive. For example, specify 80 for 80%.
     },
     "minimalAction": "A String", # Minimal action to be taken on an instance. You can specify either RESTART to restart existing instances or REPLACE to delete and create new instances from the target template. If you specify a RESTART, the Updater will attempt to perform that action only. However, if the Updater determines that the minimal action you specify is not enough to perform the update, it might perform a more disruptive action.
-    "instanceRedistributionType": "A String",
+    "instanceRedistributionType": "A String", # The  instance redistribution policy for regional managed instance groups. Valid values are:
+        # - PROACTIVE (default): The group attempts to maintain an even distribution of VM instances across zones in the region.
+        # - NONE: For non-autoscaled groups, proactive redistribution is disabled.
     "maxUnavailable": { # Encapsulates numeric value that can be either absolute or relative. # The maximum number of instances that can be unavailable during the update process. An instance is considered available if all of the following conditions are satisfied:
         #
         #
@@ -2800,12 +2790,14 @@
   ],
   "status": { # [Output Only] The status of this managed instance group.
     "stateful": { # [Output Only] Stateful status of the given Instance Group Manager.
-      "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group is stateful, i.e. has any disks in Stateful Policy or at least one per-instance config. This is determined based on the user intent, the group may be reported as not stateful even when there is still some preserved state on managed instances.
+      "isStateful": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions. This field is deprecated in favor of has_stateful_config.
+      "hasStatefulConfig": True or False, # [Output Only] A bit indicating whether the managed instance group has stateful configuration, that is, if you have configured any items in a stateful policy or in per-instance configs. The group might report that it has no stateful config even when there is still some preserved state on a managed instance, for example, if you have deleted all PICs but not yet applied those deletions.
     },
     "isStable": True or False, # [Output Only] A bit indicating whether the managed instance group is in a stable state. A stable state means that: none of the instances in the managed instance group is currently undergoing any type of change (for example, creation, restart, or deletion); no future changes are scheduled for instances in the managed instance group; and the managed instance group itself is not being modified.
     "versionTarget": { # [Output Only] A status of consistency of Instances' versions with their target version specified by version field on Instance Group Manager.
       "isReached": True or False, # [Output Only] A bit indicating whether version target has been reached in this managed instance group, i.e. all instances are in their target version. Instances' target version are specified by version field on Instance Group Manager.
     },
+    "autoscaler": "A String", # [Output Only] The URL of the Autoscaler that targets this instance group manager.
   },
   "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
   "autoHealingPolicies": [ # The autohealing policy for this managed instance group. You can specify only one value.
@@ -2867,22 +2859,16 @@
     },
   ],
   "region": "A String", # [Output Only] The URL of the region where the managed instance group resides (for regional resources).
-  "targetSize": 42, # The target number of running instances for this managed instance group. Deleting or abandoning instances reduces this number. Resizing the group changes this number.
+  "targetSize": 42, # The target number of running instances for this managed instance group. You can reduce this number by using the instanceGroupManager deleteInstances or abandonInstances methods. Resizing the group also changes this number.
   "distributionPolicy": { # Policy specifying intended distribution of instances in regional managed instance group.
     "zones": [ # Zones where the regional managed instance group will create and manage instances.
       {
         "zone": "A String", # The URL of the zone. The zone must exist in the region where the managed instance group is located.
       },
     ],
+    "targetShape": "A String", # The shape to which the group converges either proactively or on resize events (depending on the value set in updatePolicy.instanceRedistributionType). The possible values are EVEN and ANY. For EVEN the group attempts to preserve a balanced number of instances across zones. For ANY the group creates new instances where resources are available to fulfill the request; as a result, instances may be distributed unevenly across zones in this mode. The default value is EVEN.
   },
   "statefulPolicy": { # Stateful configuration for this Instanced Group Manager
-    "preservedResources": { # Configuration of all preserved resources.
-      "disks": [ # Disks created on the instances that will be preserved on instance delete, resize down, etc.
-        {
-          "deviceName": "A String", # Device name of the disk to be preserved
-        },
-      ],
-    },
     "preservedState": { # Configuration of preserved resources.
       "disks": { # Disks created on the instances that will be preserved on instance delete, update, etc. This map is keyed with the device names of the disks.
         "a_key": {
@@ -2905,26 +2891,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -2940,10 +2930,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -2961,38 +2951,21 @@
 </div>
 
 <div class="method">
-    <code class="details" id="updatePerInstanceConfigs">updatePerInstanceConfigs(project, zone, instanceGroupManager, body, requestId=None)</code>
-  <pre>Insert or update (for the ones that already exist) per-instance configs for the managed instance group. perInstanceConfig.instance serves as a key used to distinguish whether to perform insert or patch.
+    <code class="details" id="updatePerInstanceConfigs">updatePerInstanceConfigs(project, zone, instanceGroupManager, body=None, requestId=None)</code>
+  <pre>Inserts or updates per-instance configs for the managed instance group. perInstanceConfig.name serves as a key used to distinguish whether to perform insert or patch.
 
 Args:
   project: string, Project ID for this request. (required)
   zone: string, The name of the zone where the managed instance group is located. It should conform to RFC1035. (required)
   instanceGroupManager: string, The name of the managed instance group. It should conform to RFC1035. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # InstanceGroupManagers.updatePerInstanceConfigs
     "perInstanceConfigs": [ # The list of per-instance configs to insert or patch on this managed instance group.
       {
-        "override": { # Overrides of stateful properties for a given instance
-          "origin": "A String", # [Output Only] Indicates where does the override come from.
-          "disks": [ # Disk overrides defined for this instance. According to documentation the maximum number of disks attached to an instance is 128: https://cloud.google.com/compute/docs/disks/ However, compute API defines the limit at 140, so this is what we check.
-            {
-              "deviceName": "A String", # The name of the device on the VM
-              "mode": "A String", # The mode in which to attach this disk, either READ_WRITE or READ_ONLY. If not specified, the default is to attach the disk in READ_WRITE mode.
-              "source": "A String", # The disk that is/will be mounted
-            },
-          ],
-          "metadata": [ # Metadata overrides defined for this instance. TODO(b/69785416) validate the total length is <9 KB
-            {
-              "value": "A String", # Value for the metadata entry. These are free-form strings, and only have meaning as interpreted by the image running in the instance. The only restriction placed on values is that their size must be less than or equal to 262144 bytes (256 KiB).
-              "key": "A String", # Key for the metadata entry. Keys must conform to the following regexp: [a-zA-Z0-9-_]+, and be less than 128 bytes in length. This is reflected as part of a URL in the metadata server. Additionally, to avoid ambiguity, keys must not conflict with any other metadata keys for the project.
-            },
-          ],
-        },
-        "instance": "A String", # The URL of the instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same instance URL exists then it will be updated, otherwise a new one will be created.
-        "name": "A String", # The name of the per-instance config and the corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operation, i.e. if per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in a failure.
-        "preservedState": { # Preserved state for a given instance. # Intended preserved state for the given instance. Does not contain state generated based on Stateful Policy.
+        "name": "A String", # The name of a per-instance config and its corresponding instance. Serves as a merge key during UpdatePerInstanceConfigs operations, that is, if a per-instance config with the same name exists then it will be updated, otherwise a new one will be created for the VM instance with the same name. An attempt to create a per-instance config for a VM instance that either doesn't exist or is not part of the group will result in an error.
+        "preservedState": { # Preserved state for a given instance. # The intended preserved state for the given instance. Does not contain preserved state generated from a stateful policy.
           "disks": { # Preserved disks defined for this instance. This map is keyed with the device names of the disks.
             "a_key": {
               "source": "A String", # The URL of the disk resource that is stateful and should be attached to the VM instance.
@@ -3004,7 +2977,7 @@
             "a_key": "A String",
           },
         },
-        "fingerprint": "A String", # Fingerprint of this per-instance config. This field may be used in optimistic locking. It will be ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
+        "fingerprint": "A String", # Fingerprint of this per-instance config. This field can be used in optimistic locking. It is ignored when inserting a per-instance config. An up-to-date fingerprint must be provided in order to update an existing per-instance config or the field needs to be unset.
       },
     ],
   }
@@ -3020,26 +2993,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -3055,10 +3032,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.