chore: regens API reference docs (#889)

diff --git a/docs/dyn/spanner_v1.projects.instances.html b/docs/dyn/spanner_v1.projects.instances.html
index b73265d..29e0090 100644
--- a/docs/dyn/spanner_v1.projects.instances.html
+++ b/docs/dyn/spanner_v1.projects.instances.html
@@ -75,6 +75,21 @@
 <h1><a href="spanner_v1.html">Cloud Spanner API</a> . <a href="spanner_v1.projects.html">projects</a> . <a href="spanner_v1.projects.instances.html">instances</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
+  <code><a href="spanner_v1.projects.instances.backupOperations.html">backupOperations()</a></code>
+</p>
+<p class="firstline">Returns the backupOperations Resource.</p>
+
+<p class="toc_element">
+  <code><a href="spanner_v1.projects.instances.backups.html">backups()</a></code>
+</p>
+<p class="firstline">Returns the backups Resource.</p>
+
+<p class="toc_element">
+  <code><a href="spanner_v1.projects.instances.databaseOperations.html">databaseOperations()</a></code>
+</p>
+<p class="firstline">Returns the databaseOperations Resource.</p>
+
+<p class="toc_element">
   <code><a href="spanner_v1.projects.instances.databases.html">databases()</a></code>
 </p>
 <p class="firstline">Returns the databases Resource.</p>
@@ -85,35 +100,35 @@
 <p class="firstline">Returns the operations Resource.</p>
 
 <p class="toc_element">
-  <code><a href="#create">create(parent, body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates an instance and begins preparing it to begin serving. The</p>
 <p class="toc_element">
   <code><a href="#delete">delete(name, x__xgafv=None)</a></code></p>
 <p class="firstline">Deletes an instance.</p>
 <p class="toc_element">
-  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+  <code><a href="#get">get(name, fieldMask=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets information about a particular instance.</p>
 <p class="toc_element">
   <code><a href="#getIamPolicy">getIamPolicy(resource, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the access control policy for an instance resource. Returns an empty</p>
 <p class="toc_element">
-  <code><a href="#list">list(parent, pageToken=None, x__xgafv=None, pageSize=None, filter=None)</a></code></p>
+  <code><a href="#list">list(parent, pageSize=None, pageToken=None, x__xgafv=None, filter=None)</a></code></p>
 <p class="firstline">Lists all instances in the given project.</p>
 <p class="toc_element">
   <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(name, body, x__xgafv=None)</a></code></p>
+  <code><a href="#patch">patch(name, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates an instance, and begins allocating or releasing resources</p>
 <p class="toc_element">
-  <code><a href="#setIamPolicy">setIamPolicy(resource, body, x__xgafv=None)</a></code></p>
+  <code><a href="#setIamPolicy">setIamPolicy(resource, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Sets the access control policy on an instance resource. Replaces any</p>
 <p class="toc_element">
-  <code><a href="#testIamPermissions">testIamPermissions(resource, body, x__xgafv=None)</a></code></p>
+  <code><a href="#testIamPermissions">testIamPermissions(resource, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Returns permissions that the caller has on the specified instance resource.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(parent, body, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body=None, x__xgafv=None)</code>
   <pre>Creates an instance and begins preparing it to begin serving. The
 returned long-running operation
 can be used to track the progress of preparing the new
@@ -142,7 +157,7 @@
   * The instance's state becomes `READY`.
 
 The returned long-running operation will
-have a name of the format `<instance_name>/operations/<operation_id>` and
+have a name of the format `&lt;instance_name&gt;/operations/&lt;operation_id&gt;` and
 can be used to track creation of the instance.  The
 metadata field type is
 CreateInstanceMetadata.
@@ -151,8 +166,8 @@
 
 Args:
   parent: string, Required. The name of the project in which to create the instance. Values
-are of the form `projects/<project>`. (required)
-  body: object, The request body. (required)
+are of the form `projects/&lt;project&gt;`. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The request for CreateInstance.
@@ -160,12 +175,12 @@
         # form `a-z*[a-z0-9]` and must be between 2 and 64 characters in
         # length.
     "instance": { # An isolated set of Cloud Spanner resources on which databases can be hosted. # Required. The instance to create.  The name may be omitted, but if
-        # specified must be `<parent>/instances/<instance_id>`.
+        # specified must be `&lt;parent&gt;/instances/&lt;instance_id&gt;`.
       "displayName": "A String", # Required. The descriptive name for this instance as it appears in UIs.
           # Must be unique per project and between 4 and 30 characters in length.
       "name": "A String", # Required. A unique identifier for the instance, which cannot be changed
           # after the instance is created. Values are of the form
-          # `projects/<project>/instances/a-z*[a-z0-9]`. The final
+          # `projects/&lt;project&gt;/instances/a-z*[a-z0-9]`. The final
           # segment of the name must be between 2 and 64 characters in length.
       "labels": { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud
           # resources into groups that reflect a customer's organizational needs and
@@ -195,14 +210,18 @@
           # either omitted or set to `CREATING`. For
           # UpdateInstance, the state must be
           # either omitted or set to `READY`.
-      "nodeCount": 42, # Required. The number of nodes allocated to this instance. This may be zero
-          # in API responses for instances that are not yet in state `READY`.
+      "endpointUris": [ # Deprecated. This field is not populated.
+        "A String",
+      ],
+      "nodeCount": 42, # The number of nodes allocated to this instance. This
+          # may be zero in API responses for instances that are not yet in state
+          # `READY`.
           #
           # See [the
           # documentation](https://cloud.google.com/spanner/docs/instances#node_count)
           # for more information about nodes.
       "config": "A String", # Required. The name of the instance's configuration. Values are of the form
-          # `projects/<project>/instanceConfigs/<configuration>`. See
+          # `projects/&lt;project&gt;/instanceConfigs/&lt;configuration&gt;`. See
           # also InstanceConfig and
           # ListInstanceConfigs.
     },
@@ -218,64 +237,13 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -303,6 +271,12 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
   }</pre>
 </div>
 
@@ -322,7 +296,7 @@
 
 Args:
   name: string, Required. The name of the instance to be deleted. Values are of the form
-`projects/<project>/instances/<instance>` (required)
+`projects/&lt;project&gt;/instances/&lt;instance&gt;` (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -344,12 +318,15 @@
 </div>
 
 <div class="method">
-    <code class="details" id="get">get(name, x__xgafv=None)</code>
+    <code class="details" id="get">get(name, fieldMask=None, x__xgafv=None)</code>
   <pre>Gets information about a particular instance.
 
 Args:
   name: string, Required. The name of the requested instance. Values are of the form
-`projects/<project>/instances/<instance>`. (required)
+`projects/&lt;project&gt;/instances/&lt;instance&gt;`. (required)
+  fieldMask: string, If field_mask is present, specifies the subset of Instance fields that
+should be returned.
+If absent, all Instance fields are returned.
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -363,7 +340,7 @@
         # Must be unique per project and between 4 and 30 characters in length.
     "name": "A String", # Required. A unique identifier for the instance, which cannot be changed
         # after the instance is created. Values are of the form
-        # `projects/<project>/instances/a-z*[a-z0-9]`. The final
+        # `projects/&lt;project&gt;/instances/a-z*[a-z0-9]`. The final
         # segment of the name must be between 2 and 64 characters in length.
     "labels": { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud
         # resources into groups that reflect a customer's organizational needs and
@@ -393,14 +370,18 @@
         # either omitted or set to `CREATING`. For
         # UpdateInstance, the state must be
         # either omitted or set to `READY`.
-    "nodeCount": 42, # Required. The number of nodes allocated to this instance. This may be zero
-        # in API responses for instances that are not yet in state `READY`.
+    "endpointUris": [ # Deprecated. This field is not populated.
+      "A String",
+    ],
+    "nodeCount": 42, # The number of nodes allocated to this instance. This
+        # may be zero in API responses for instances that are not yet in state
+        # `READY`.
         #
         # See [the
         # documentation](https://cloud.google.com/spanner/docs/instances#node_count)
         # for more information about nodes.
     "config": "A String", # Required. The name of the instance's configuration. Values are of the form
-        # `projects/<project>/instanceConfigs/<configuration>`. See
+        # `projects/&lt;project&gt;/instanceConfigs/&lt;configuration&gt;`. See
         # also InstanceConfig and
         # ListInstanceConfigs.
   }</pre>
@@ -415,11 +396,22 @@
 resource.
 
 Args:
-  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being retrieved. The format is `projects/<project ID>/instances/<instance ID>` for instance resources and `projects/<project ID>/instances/<instance ID>/databases/<database ID>` for database resources. (required)
+  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being retrieved. The format is `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;` for instance resources and `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;/databases/&lt;database ID&gt;` for database resources. (required)
   body: object, The request body.
     The object takes the form of:
 
 { # Request message for `GetIamPolicy` method.
+    "options": { # Encapsulates settings provided to GetIamPolicy. # OPTIONAL: A `GetPolicyOptions` object for specifying options to
+        # `GetIamPolicy`. This field is only used by Cloud IAM.
+      "requestedPolicyVersion": 42, # Optional. The policy format version to be returned.
+          #
+          # Valid values are 0, 1, and 3. Requests specifying an invalid value will be
+          # rejected.
+          #
+          # Requests for policies with any conditional bindings must specify version 3.
+          # Policies without any conditional bindings may specify any valid value or
+          # leave the field unset.
+    },
   }
 
   x__xgafv: string, V1 error format.
@@ -430,53 +422,72 @@
 Returns:
   An object of the form:
 
-    { # Defines an Identity and Access Management (IAM) policy. It is used to
-      # specify access control policies for Cloud Platform resources.
+    { # An Identity and Access Management (IAM) policy, which specifies access
+      # controls for Google Cloud resources.
       #
       #
-      # A `Policy` consists of a list of `bindings`. A `binding` binds a list of
-      # `members` to a `role`, where the members can be user accounts, Google groups,
-      # Google domains, and service accounts. A `role` is a named list of permissions
-      # defined by IAM.
+      # A `Policy` is a collection of `bindings`. A `binding` binds one or more
+      # `members` to a single `role`. Members can be user accounts, service accounts,
+      # Google groups, and domains (such as G Suite). A `role` is a named list of
+      # permissions; each `role` can be an IAM predefined role or a user-created
+      # custom role.
       #
-      # **JSON Example**
+      # Optionally, a `binding` can specify a `condition`, which is a logical
+      # expression that allows access to a resource only if the expression evaluates
+      # to `true`. A condition can add constraints based on attributes of the
+      # request, the resource, or both.
+      #
+      # **JSON example:**
       #
       #     {
       #       "bindings": [
       #         {
-      #           "role": "roles/owner",
+      #           "role": "roles/resourcemanager.organizationAdmin",
       #           "members": [
       #             "user:mike@example.com",
       #             "group:admins@example.com",
       #             "domain:google.com",
-      #             "serviceAccount:my-other-app@appspot.gserviceaccount.com"
+      #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
       #           ]
       #         },
       #         {
-      #           "role": "roles/viewer",
-      #           "members": ["user:sean@example.com"]
+      #           "role": "roles/resourcemanager.organizationViewer",
+      #           "members": ["user:eve@example.com"],
+      #           "condition": {
+      #             "title": "expirable access",
+      #             "description": "Does not grant access after Sep 2020",
+      #             "expression": "request.time &lt; timestamp('2020-10-01T00:00:00.000Z')",
+      #           }
       #         }
-      #       ]
+      #       ],
+      #       "etag": "BwWWja0YfJA=",
+      #       "version": 3
       #     }
       #
-      # **YAML Example**
+      # **YAML example:**
       #
       #     bindings:
       #     - members:
       #       - user:mike@example.com
       #       - group:admins@example.com
       #       - domain:google.com
-      #       - serviceAccount:my-other-app@appspot.gserviceaccount.com
-      #       role: roles/owner
+      #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
+      #       role: roles/resourcemanager.organizationAdmin
       #     - members:
-      #       - user:sean@example.com
-      #       role: roles/viewer
-      #
+      #       - user:eve@example.com
+      #       role: roles/resourcemanager.organizationViewer
+      #       condition:
+      #         title: expirable access
+      #         description: Does not grant access after Sep 2020
+      #         expression: request.time &lt; timestamp('2020-10-01T00:00:00.000Z')
+      #     - etag: BwWWja0YfJA=
+      #     - version: 3
       #
       # For a description of IAM and its features, see the
-      # [IAM developer's guide](https://cloud.google.com/iam/docs).
-    "bindings": [ # Associates a list of `members` to a `role`.
-        # `bindings` with no members will result in an error.
+      # [IAM documentation](https://cloud.google.com/iam/docs/).
+    "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
+        # `condition` that determines how and when the `bindings` are applied. Each
+        # of the `bindings` must contain at least one member.
       { # Associates `members` with a `role`.
         "role": "A String", # Role that is assigned to `members`.
             # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
@@ -490,7 +501,7 @@
             #    who is authenticated with a Google account or a service account.
             #
             # * `user:{emailid}`: An email address that represents a specific Google
-            #    account. For example, `alice@gmail.com` .
+            #    account. For example, `alice@example.com` .
             #
             #
             # * `serviceAccount:{emailid}`: An email address that represents a service
@@ -499,30 +510,73 @@
             # * `group:{emailid}`: An email address that represents a Google group.
             #    For example, `admins@example.com`.
             #
+            # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a user that has been recently deleted. For
+            #    example, `alice@example.com?uid=123456789012345678901`. If the user is
+            #    recovered, this value reverts to `user:{emailid}` and the recovered user
+            #    retains the role in the binding.
+            #
+            # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
+            #    unique identifier) representing a service account that has been recently
+            #    deleted. For example,
+            #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
+            #    If the service account is undeleted, this value reverts to
+            #    `serviceAccount:{emailid}` and the undeleted service account retains the
+            #    role in the binding.
+            #
+            # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a Google group that has been recently
+            #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
+            #    the group is recovered, this value reverts to `group:{emailid}` and the
+            #    recovered group retains the role in the binding.
+            #
             #
             # * `domain:{domain}`: The G Suite domain (primary) that represents all the
             #    users of that domain. For example, `google.com` or `example.com`.
             #
           "A String",
         ],
-        "condition": { # Represents an expression text. Example: # The condition that is associated with this binding.
+        "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
             # NOTE: An unsatisfied condition will not allow user access via current
             # binding. Different bindings, including their conditions, are examined
             # independently.
+            # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
+            # are documented at https://github.com/google/cel-spec.
             #
-            #     title: "User account presence"
-            #     description: "Determines whether the request has a user account"
-            #     expression: "size(request.user) > 0"
-          "location": "A String", # An optional string indicating the location of the expression for error
+            # Example (Comparison):
+            #
+            #     title: "Summary size limit"
+            #     description: "Determines if a summary is less than 100 chars"
+            #     expression: "document.summary.size() &lt; 100"
+            #
+            # Example (Equality):
+            #
+            #     title: "Requestor is owner"
+            #     description: "Determines if requestor is the document owner"
+            #     expression: "document.owner == request.auth.claims.email"
+            #
+            # Example (Logic):
+            #
+            #     title: "Public documents"
+            #     description: "Determine whether the document should be publicly visible"
+            #     expression: "document.type != 'private' &amp;&amp; document.type != 'internal'"
+            #
+            # Example (Data Manipulation):
+            #
+            #     title: "Notification string"
+            #     description: "Create a notification string with a timestamp."
+            #     expression: "'New message received at ' + string(document.create_time)"
+            #
+            # The exact variables and functions that may be referenced within an expression
+            # are determined by the service that evaluates it. See the service
+            # documentation for additional information.
+          "location": "A String", # Optional. String indicating the location of the expression for error
               # reporting, e.g. a file name and a position in the file.
-          "expression": "A String", # Textual representation of an expression in
-              # Common Expression Language syntax.
-              #
-              # The application context of the containing message determines which
-              # well-known feature set of CEL is supported.
-          "description": "A String", # An optional description of the expression. This is a longer text which
+          "expression": "A String", # Textual representation of an expression in Common Expression Language
+              # syntax.
+          "description": "A String", # Optional. Description of the expression. This is a longer text which
               # describes the expression, e.g. when hovered over it in a UI.
-          "title": "A String", # An optional title for the expression, i.e. a short string describing
+          "title": "A String", # Optional. Title for the expression, i.e. a short string describing
               # its purpose. This can be used e.g. in UIs which allow to enter the
               # expression.
         },
@@ -536,19 +590,43 @@
         # systems are expected to put that etag in the request to `setIamPolicy` to
         # ensure that their change will be applied to the same version of the policy.
         #
-        # If no `etag` is provided in the call to `setIamPolicy`, then the existing
-        # policy is overwritten blindly.
-    "version": 42, # Deprecated.
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+    "version": 42, # Specifies the format of the policy.
+        #
+        # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
+        # are rejected.
+        #
+        # Any operation that affects conditional role bindings must specify version
+        # `3`. This requirement applies to the following operations:
+        #
+        # * Getting a policy that includes a conditional role binding
+        # * Adding a conditional role binding to a policy
+        # * Changing a conditional role binding in a policy
+        # * Removing any role binding, with or without a condition, from a policy
+        #   that includes conditions
+        #
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+        #
+        # If a policy does not include any conditions, operations on that policy may
+        # specify any valid version or leave the field unset.
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(parent, pageToken=None, x__xgafv=None, pageSize=None, filter=None)</code>
+    <code class="details" id="list">list(parent, pageSize=None, pageToken=None, x__xgafv=None, filter=None)</code>
   <pre>Lists all instances in the given project.
 
 Args:
   parent: string, Required. The name of the project for which a list of instances is
-requested. Values are of the form `projects/<project>`. (required)
+requested. Values are of the form `projects/&lt;project&gt;`. (required)
+  pageSize: integer, Number of instances to be returned in the response. If 0 or less, defaults
+to the server's maximum allowed page size.
   pageToken: string, If non-empty, `page_token` should contain a
 next_page_token from a
 previous ListInstancesResponse.
@@ -556,8 +634,6 @@
     Allowed values
       1 - v1 error format
       2 - v2 error format
-  pageSize: integer, Number of instances to be returned in the response. If 0 or less, defaults
-to the server's maximum allowed page size.
   filter: string, An expression for filtering the results of the request. Filter rules are
 case insensitive. The fields eligible for filtering are:
 
@@ -567,14 +643,14 @@
 
 Some examples of using filters are:
 
-  * `name:*` --> The instance has a name.
-  * `name:Howl` --> The instance's name contains the string "howl".
-  * `name:HOWL` --> Equivalent to above.
-  * `NAME:howl` --> Equivalent to above.
-  * `labels.env:*` --> The instance has the label "env".
-  * `labels.env:dev` --> The instance has the label "env" and the value of
+  * `name:*` --&gt; The instance has a name.
+  * `name:Howl` --&gt; The instance's name contains the string "howl".
+  * `name:HOWL` --&gt; Equivalent to above.
+  * `NAME:howl` --&gt; Equivalent to above.
+  * `labels.env:*` --&gt; The instance has the label "env".
+  * `labels.env:dev` --&gt; The instance has the label "env" and the value of
                        the label contains the string "dev".
-  * `name:howl labels.env:dev` --> The instance's name contains "howl" and
+  * `name:howl labels.env:dev` --&gt; The instance's name contains "howl" and
                                  it has the label "env" with its value
                                  containing "dev".
 
@@ -591,7 +667,7 @@
             # Must be unique per project and between 4 and 30 characters in length.
         "name": "A String", # Required. A unique identifier for the instance, which cannot be changed
             # after the instance is created. Values are of the form
-            # `projects/<project>/instances/a-z*[a-z0-9]`. The final
+            # `projects/&lt;project&gt;/instances/a-z*[a-z0-9]`. The final
             # segment of the name must be between 2 and 64 characters in length.
         "labels": { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud
             # resources into groups that reflect a customer's organizational needs and
@@ -621,14 +697,18 @@
             # either omitted or set to `CREATING`. For
             # UpdateInstance, the state must be
             # either omitted or set to `READY`.
-        "nodeCount": 42, # Required. The number of nodes allocated to this instance. This may be zero
-            # in API responses for instances that are not yet in state `READY`.
+        "endpointUris": [ # Deprecated. This field is not populated.
+          "A String",
+        ],
+        "nodeCount": 42, # The number of nodes allocated to this instance. This
+            # may be zero in API responses for instances that are not yet in state
+            # `READY`.
             #
             # See [the
             # documentation](https://cloud.google.com/spanner/docs/instances#node_count)
             # for more information about nodes.
         "config": "A String", # Required. The name of the instance's configuration. Values are of the form
-            # `projects/<project>/instanceConfigs/<configuration>`. See
+            # `projects/&lt;project&gt;/instanceConfigs/&lt;configuration&gt;`. See
             # also InstanceConfig and
             # ListInstanceConfigs.
       },
@@ -651,7 +731,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="patch">patch(name, body, x__xgafv=None)</code>
+    <code class="details" id="patch">patch(name, body=None, x__xgafv=None)</code>
   <pre>Updates an instance, and begins allocating or releasing resources
 as requested. The returned long-running
 operation can be used to track the
@@ -683,7 +763,7 @@
   * The instance's new resource levels are readable via the API.
 
 The returned long-running operation will
-have a name of the format `<instance_name>/operations/<operation_id>` and
+have a name of the format `&lt;instance_name&gt;/operations/&lt;operation_id&gt;` and
 can be used to track the instance modification.  The
 metadata field type is
 UpdateInstanceMetadata.
@@ -696,19 +776,19 @@
 Args:
   name: string, Required. A unique identifier for the instance, which cannot be changed
 after the instance is created. Values are of the form
-`projects/<project>/instances/a-z*[a-z0-9]`. The final
+`projects/&lt;project&gt;/instances/a-z*[a-z0-9]`. The final
 segment of the name must be between 2 and 64 characters in length. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The request for UpdateInstance.
     "instance": { # An isolated set of Cloud Spanner resources on which databases can be hosted. # Required. The instance to update, which must always include the instance
-        # name.  Otherwise, only fields mentioned in [][google.spanner.admin.instance.v1.UpdateInstanceRequest.field_mask] need be included.
+        # name.  Otherwise, only fields mentioned in field_mask need be included.
       "displayName": "A String", # Required. The descriptive name for this instance as it appears in UIs.
           # Must be unique per project and between 4 and 30 characters in length.
       "name": "A String", # Required. A unique identifier for the instance, which cannot be changed
           # after the instance is created. Values are of the form
-          # `projects/<project>/instances/a-z*[a-z0-9]`. The final
+          # `projects/&lt;project&gt;/instances/a-z*[a-z0-9]`. The final
           # segment of the name must be between 2 and 64 characters in length.
       "labels": { # Cloud Labels are a flexible and lightweight mechanism for organizing cloud
           # resources into groups that reflect a customer's organizational needs and
@@ -738,20 +818,24 @@
           # either omitted or set to `CREATING`. For
           # UpdateInstance, the state must be
           # either omitted or set to `READY`.
-      "nodeCount": 42, # Required. The number of nodes allocated to this instance. This may be zero
-          # in API responses for instances that are not yet in state `READY`.
+      "endpointUris": [ # Deprecated. This field is not populated.
+        "A String",
+      ],
+      "nodeCount": 42, # The number of nodes allocated to this instance. This
+          # may be zero in API responses for instances that are not yet in state
+          # `READY`.
           #
           # See [the
           # documentation](https://cloud.google.com/spanner/docs/instances#node_count)
           # for more information about nodes.
       "config": "A String", # Required. The name of the instance's configuration. Values are of the form
-          # `projects/<project>/instanceConfigs/<configuration>`. See
+          # `projects/&lt;project&gt;/instanceConfigs/&lt;configuration&gt;`. See
           # also InstanceConfig and
           # ListInstanceConfigs.
     },
-    "fieldMask": "A String", # Required. A mask specifying which fields in [][google.spanner.admin.instance.v1.UpdateInstanceRequest.instance] should be updated.
+    "fieldMask": "A String", # Required. A mask specifying which fields in Instance should be updated.
         # The field mask must always be specified; this prevents any future fields in
-        # [][google.spanner.admin.instance.v1.Instance] from being erased accidentally by clients that do not know
+        # Instance from being erased accidentally by clients that do not know
         # about them.
   }
 
@@ -765,64 +849,13 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -850,11 +883,17 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="setIamPolicy">setIamPolicy(resource, body, x__xgafv=None)</code>
+    <code class="details" id="setIamPolicy">setIamPolicy(resource, body=None, x__xgafv=None)</code>
   <pre>Sets the access control policy on an instance resource. Replaces any
 existing policy.
 
@@ -862,61 +901,80 @@
 resource.
 
 Args:
-  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being set. The format is `projects/<project ID>/instances/<instance ID>` for instance resources and `projects/<project ID>/instances/<instance ID>/databases/<database ID>` for databases resources. (required)
-  body: object, The request body. (required)
+  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being set. The format is `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;` for instance resources and `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;/databases/&lt;database ID&gt;` for databases resources. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request message for `SetIamPolicy` method.
-    "policy": { # Defines an Identity and Access Management (IAM) policy. It is used to # REQUIRED: The complete policy to be applied to the `resource`. The size of
+    "policy": { # An Identity and Access Management (IAM) policy, which specifies access # REQUIRED: The complete policy to be applied to the `resource`. The size of
         # the policy is limited to a few 10s of KB. An empty policy is a
         # valid policy but certain Cloud Platform services (such as Projects)
         # might reject them.
-        # specify access control policies for Cloud Platform resources.
+        # controls for Google Cloud resources.
         #
         #
-        # A `Policy` consists of a list of `bindings`. A `binding` binds a list of
-        # `members` to a `role`, where the members can be user accounts, Google groups,
-        # Google domains, and service accounts. A `role` is a named list of permissions
-        # defined by IAM.
+        # A `Policy` is a collection of `bindings`. A `binding` binds one or more
+        # `members` to a single `role`. Members can be user accounts, service accounts,
+        # Google groups, and domains (such as G Suite). A `role` is a named list of
+        # permissions; each `role` can be an IAM predefined role or a user-created
+        # custom role.
         #
-        # **JSON Example**
+        # Optionally, a `binding` can specify a `condition`, which is a logical
+        # expression that allows access to a resource only if the expression evaluates
+        # to `true`. A condition can add constraints based on attributes of the
+        # request, the resource, or both.
+        #
+        # **JSON example:**
         #
         #     {
         #       "bindings": [
         #         {
-        #           "role": "roles/owner",
+        #           "role": "roles/resourcemanager.organizationAdmin",
         #           "members": [
         #             "user:mike@example.com",
         #             "group:admins@example.com",
         #             "domain:google.com",
-        #             "serviceAccount:my-other-app@appspot.gserviceaccount.com"
+        #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
         #           ]
         #         },
         #         {
-        #           "role": "roles/viewer",
-        #           "members": ["user:sean@example.com"]
+        #           "role": "roles/resourcemanager.organizationViewer",
+        #           "members": ["user:eve@example.com"],
+        #           "condition": {
+        #             "title": "expirable access",
+        #             "description": "Does not grant access after Sep 2020",
+        #             "expression": "request.time &lt; timestamp('2020-10-01T00:00:00.000Z')",
+        #           }
         #         }
-        #       ]
+        #       ],
+        #       "etag": "BwWWja0YfJA=",
+        #       "version": 3
         #     }
         #
-        # **YAML Example**
+        # **YAML example:**
         #
         #     bindings:
         #     - members:
         #       - user:mike@example.com
         #       - group:admins@example.com
         #       - domain:google.com
-        #       - serviceAccount:my-other-app@appspot.gserviceaccount.com
-        #       role: roles/owner
+        #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
+        #       role: roles/resourcemanager.organizationAdmin
         #     - members:
-        #       - user:sean@example.com
-        #       role: roles/viewer
-        #
+        #       - user:eve@example.com
+        #       role: roles/resourcemanager.organizationViewer
+        #       condition:
+        #         title: expirable access
+        #         description: Does not grant access after Sep 2020
+        #         expression: request.time &lt; timestamp('2020-10-01T00:00:00.000Z')
+        #     - etag: BwWWja0YfJA=
+        #     - version: 3
         #
         # For a description of IAM and its features, see the
-        # [IAM developer's guide](https://cloud.google.com/iam/docs).
-      "bindings": [ # Associates a list of `members` to a `role`.
-          # `bindings` with no members will result in an error.
+        # [IAM documentation](https://cloud.google.com/iam/docs/).
+      "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
+          # `condition` that determines how and when the `bindings` are applied. Each
+          # of the `bindings` must contain at least one member.
         { # Associates `members` with a `role`.
           "role": "A String", # Role that is assigned to `members`.
               # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
@@ -930,7 +988,7 @@
               #    who is authenticated with a Google account or a service account.
               #
               # * `user:{emailid}`: An email address that represents a specific Google
-              #    account. For example, `alice@gmail.com` .
+              #    account. For example, `alice@example.com` .
               #
               #
               # * `serviceAccount:{emailid}`: An email address that represents a service
@@ -939,30 +997,73 @@
               # * `group:{emailid}`: An email address that represents a Google group.
               #    For example, `admins@example.com`.
               #
+              # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
+              #    identifier) representing a user that has been recently deleted. For
+              #    example, `alice@example.com?uid=123456789012345678901`. If the user is
+              #    recovered, this value reverts to `user:{emailid}` and the recovered user
+              #    retains the role in the binding.
+              #
+              # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
+              #    unique identifier) representing a service account that has been recently
+              #    deleted. For example,
+              #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
+              #    If the service account is undeleted, this value reverts to
+              #    `serviceAccount:{emailid}` and the undeleted service account retains the
+              #    role in the binding.
+              #
+              # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
+              #    identifier) representing a Google group that has been recently
+              #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
+              #    the group is recovered, this value reverts to `group:{emailid}` and the
+              #    recovered group retains the role in the binding.
+              #
               #
               # * `domain:{domain}`: The G Suite domain (primary) that represents all the
               #    users of that domain. For example, `google.com` or `example.com`.
               #
             "A String",
           ],
-          "condition": { # Represents an expression text. Example: # The condition that is associated with this binding.
+          "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
               # NOTE: An unsatisfied condition will not allow user access via current
               # binding. Different bindings, including their conditions, are examined
               # independently.
+              # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
+              # are documented at https://github.com/google/cel-spec.
               #
-              #     title: "User account presence"
-              #     description: "Determines whether the request has a user account"
-              #     expression: "size(request.user) > 0"
-            "location": "A String", # An optional string indicating the location of the expression for error
+              # Example (Comparison):
+              #
+              #     title: "Summary size limit"
+              #     description: "Determines if a summary is less than 100 chars"
+              #     expression: "document.summary.size() &lt; 100"
+              #
+              # Example (Equality):
+              #
+              #     title: "Requestor is owner"
+              #     description: "Determines if requestor is the document owner"
+              #     expression: "document.owner == request.auth.claims.email"
+              #
+              # Example (Logic):
+              #
+              #     title: "Public documents"
+              #     description: "Determine whether the document should be publicly visible"
+              #     expression: "document.type != 'private' &amp;&amp; document.type != 'internal'"
+              #
+              # Example (Data Manipulation):
+              #
+              #     title: "Notification string"
+              #     description: "Create a notification string with a timestamp."
+              #     expression: "'New message received at ' + string(document.create_time)"
+              #
+              # The exact variables and functions that may be referenced within an expression
+              # are determined by the service that evaluates it. See the service
+              # documentation for additional information.
+            "location": "A String", # Optional. String indicating the location of the expression for error
                 # reporting, e.g. a file name and a position in the file.
-            "expression": "A String", # Textual representation of an expression in
-                # Common Expression Language syntax.
-                #
-                # The application context of the containing message determines which
-                # well-known feature set of CEL is supported.
-            "description": "A String", # An optional description of the expression. This is a longer text which
+            "expression": "A String", # Textual representation of an expression in Common Expression Language
+                # syntax.
+            "description": "A String", # Optional. Description of the expression. This is a longer text which
                 # describes the expression, e.g. when hovered over it in a UI.
-            "title": "A String", # An optional title for the expression, i.e. a short string describing
+            "title": "A String", # Optional. Title for the expression, i.e. a short string describing
                 # its purpose. This can be used e.g. in UIs which allow to enter the
                 # expression.
           },
@@ -976,9 +1077,31 @@
           # systems are expected to put that etag in the request to `setIamPolicy` to
           # ensure that their change will be applied to the same version of the policy.
           #
-          # If no `etag` is provided in the call to `setIamPolicy`, then the existing
-          # policy is overwritten blindly.
-      "version": 42, # Deprecated.
+          # **Important:** If you use IAM Conditions, you must include the `etag` field
+          # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+          # you to overwrite a version `3` policy with a version `1` policy, and all of
+          # the conditions in the version `3` policy are lost.
+      "version": 42, # Specifies the format of the policy.
+          #
+          # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
+          # are rejected.
+          #
+          # Any operation that affects conditional role bindings must specify version
+          # `3`. This requirement applies to the following operations:
+          #
+          # * Getting a policy that includes a conditional role binding
+          # * Adding a conditional role binding to a policy
+          # * Changing a conditional role binding in a policy
+          # * Removing any role binding, with or without a condition, from a policy
+          #   that includes conditions
+          #
+          # **Important:** If you use IAM Conditions, you must include the `etag` field
+          # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+          # you to overwrite a version `3` policy with a version `1` policy, and all of
+          # the conditions in the version `3` policy are lost.
+          #
+          # If a policy does not include any conditions, operations on that policy may
+          # specify any valid version or leave the field unset.
     },
   }
 
@@ -990,53 +1113,72 @@
 Returns:
   An object of the form:
 
-    { # Defines an Identity and Access Management (IAM) policy. It is used to
-      # specify access control policies for Cloud Platform resources.
+    { # An Identity and Access Management (IAM) policy, which specifies access
+      # controls for Google Cloud resources.
       #
       #
-      # A `Policy` consists of a list of `bindings`. A `binding` binds a list of
-      # `members` to a `role`, where the members can be user accounts, Google groups,
-      # Google domains, and service accounts. A `role` is a named list of permissions
-      # defined by IAM.
+      # A `Policy` is a collection of `bindings`. A `binding` binds one or more
+      # `members` to a single `role`. Members can be user accounts, service accounts,
+      # Google groups, and domains (such as G Suite). A `role` is a named list of
+      # permissions; each `role` can be an IAM predefined role or a user-created
+      # custom role.
       #
-      # **JSON Example**
+      # Optionally, a `binding` can specify a `condition`, which is a logical
+      # expression that allows access to a resource only if the expression evaluates
+      # to `true`. A condition can add constraints based on attributes of the
+      # request, the resource, or both.
+      #
+      # **JSON example:**
       #
       #     {
       #       "bindings": [
       #         {
-      #           "role": "roles/owner",
+      #           "role": "roles/resourcemanager.organizationAdmin",
       #           "members": [
       #             "user:mike@example.com",
       #             "group:admins@example.com",
       #             "domain:google.com",
-      #             "serviceAccount:my-other-app@appspot.gserviceaccount.com"
+      #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
       #           ]
       #         },
       #         {
-      #           "role": "roles/viewer",
-      #           "members": ["user:sean@example.com"]
+      #           "role": "roles/resourcemanager.organizationViewer",
+      #           "members": ["user:eve@example.com"],
+      #           "condition": {
+      #             "title": "expirable access",
+      #             "description": "Does not grant access after Sep 2020",
+      #             "expression": "request.time &lt; timestamp('2020-10-01T00:00:00.000Z')",
+      #           }
       #         }
-      #       ]
+      #       ],
+      #       "etag": "BwWWja0YfJA=",
+      #       "version": 3
       #     }
       #
-      # **YAML Example**
+      # **YAML example:**
       #
       #     bindings:
       #     - members:
       #       - user:mike@example.com
       #       - group:admins@example.com
       #       - domain:google.com
-      #       - serviceAccount:my-other-app@appspot.gserviceaccount.com
-      #       role: roles/owner
+      #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
+      #       role: roles/resourcemanager.organizationAdmin
       #     - members:
-      #       - user:sean@example.com
-      #       role: roles/viewer
-      #
+      #       - user:eve@example.com
+      #       role: roles/resourcemanager.organizationViewer
+      #       condition:
+      #         title: expirable access
+      #         description: Does not grant access after Sep 2020
+      #         expression: request.time &lt; timestamp('2020-10-01T00:00:00.000Z')
+      #     - etag: BwWWja0YfJA=
+      #     - version: 3
       #
       # For a description of IAM and its features, see the
-      # [IAM developer's guide](https://cloud.google.com/iam/docs).
-    "bindings": [ # Associates a list of `members` to a `role`.
-        # `bindings` with no members will result in an error.
+      # [IAM documentation](https://cloud.google.com/iam/docs/).
+    "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
+        # `condition` that determines how and when the `bindings` are applied. Each
+        # of the `bindings` must contain at least one member.
       { # Associates `members` with a `role`.
         "role": "A String", # Role that is assigned to `members`.
             # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
@@ -1050,7 +1192,7 @@
             #    who is authenticated with a Google account or a service account.
             #
             # * `user:{emailid}`: An email address that represents a specific Google
-            #    account. For example, `alice@gmail.com` .
+            #    account. For example, `alice@example.com` .
             #
             #
             # * `serviceAccount:{emailid}`: An email address that represents a service
@@ -1059,30 +1201,73 @@
             # * `group:{emailid}`: An email address that represents a Google group.
             #    For example, `admins@example.com`.
             #
+            # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a user that has been recently deleted. For
+            #    example, `alice@example.com?uid=123456789012345678901`. If the user is
+            #    recovered, this value reverts to `user:{emailid}` and the recovered user
+            #    retains the role in the binding.
+            #
+            # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
+            #    unique identifier) representing a service account that has been recently
+            #    deleted. For example,
+            #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
+            #    If the service account is undeleted, this value reverts to
+            #    `serviceAccount:{emailid}` and the undeleted service account retains the
+            #    role in the binding.
+            #
+            # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a Google group that has been recently
+            #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
+            #    the group is recovered, this value reverts to `group:{emailid}` and the
+            #    recovered group retains the role in the binding.
+            #
             #
             # * `domain:{domain}`: The G Suite domain (primary) that represents all the
             #    users of that domain. For example, `google.com` or `example.com`.
             #
           "A String",
         ],
-        "condition": { # Represents an expression text. Example: # The condition that is associated with this binding.
+        "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
             # NOTE: An unsatisfied condition will not allow user access via current
             # binding. Different bindings, including their conditions, are examined
             # independently.
+            # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
+            # are documented at https://github.com/google/cel-spec.
             #
-            #     title: "User account presence"
-            #     description: "Determines whether the request has a user account"
-            #     expression: "size(request.user) > 0"
-          "location": "A String", # An optional string indicating the location of the expression for error
+            # Example (Comparison):
+            #
+            #     title: "Summary size limit"
+            #     description: "Determines if a summary is less than 100 chars"
+            #     expression: "document.summary.size() &lt; 100"
+            #
+            # Example (Equality):
+            #
+            #     title: "Requestor is owner"
+            #     description: "Determines if requestor is the document owner"
+            #     expression: "document.owner == request.auth.claims.email"
+            #
+            # Example (Logic):
+            #
+            #     title: "Public documents"
+            #     description: "Determine whether the document should be publicly visible"
+            #     expression: "document.type != 'private' &amp;&amp; document.type != 'internal'"
+            #
+            # Example (Data Manipulation):
+            #
+            #     title: "Notification string"
+            #     description: "Create a notification string with a timestamp."
+            #     expression: "'New message received at ' + string(document.create_time)"
+            #
+            # The exact variables and functions that may be referenced within an expression
+            # are determined by the service that evaluates it. See the service
+            # documentation for additional information.
+          "location": "A String", # Optional. String indicating the location of the expression for error
               # reporting, e.g. a file name and a position in the file.
-          "expression": "A String", # Textual representation of an expression in
-              # Common Expression Language syntax.
-              #
-              # The application context of the containing message determines which
-              # well-known feature set of CEL is supported.
-          "description": "A String", # An optional description of the expression. This is a longer text which
+          "expression": "A String", # Textual representation of an expression in Common Expression Language
+              # syntax.
+          "description": "A String", # Optional. Description of the expression. This is a longer text which
               # describes the expression, e.g. when hovered over it in a UI.
-          "title": "A String", # An optional title for the expression, i.e. a short string describing
+          "title": "A String", # Optional. Title for the expression, i.e. a short string describing
               # its purpose. This can be used e.g. in UIs which allow to enter the
               # expression.
         },
@@ -1096,14 +1281,36 @@
         # systems are expected to put that etag in the request to `setIamPolicy` to
         # ensure that their change will be applied to the same version of the policy.
         #
-        # If no `etag` is provided in the call to `setIamPolicy`, then the existing
-        # policy is overwritten blindly.
-    "version": 42, # Deprecated.
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+    "version": 42, # Specifies the format of the policy.
+        #
+        # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
+        # are rejected.
+        #
+        # Any operation that affects conditional role bindings must specify version
+        # `3`. This requirement applies to the following operations:
+        #
+        # * Getting a policy that includes a conditional role binding
+        # * Adding a conditional role binding to a policy
+        # * Changing a conditional role binding in a policy
+        # * Removing any role binding, with or without a condition, from a policy
+        #   that includes conditions
+        #
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+        #
+        # If a policy does not include any conditions, operations on that policy may
+        # specify any valid version or leave the field unset.
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="testIamPermissions">testIamPermissions(resource, body, x__xgafv=None)</code>
+    <code class="details" id="testIamPermissions">testIamPermissions(resource, body=None, x__xgafv=None)</code>
   <pre>Returns permissions that the caller has on the specified instance resource.
 
 Attempting this RPC on a non-existent Cloud Spanner instance resource will
@@ -1112,8 +1319,8 @@
 empty set of permissions.
 
 Args:
-  resource: string, REQUIRED: The Cloud Spanner resource for which permissions are being tested. The format is `projects/<project ID>/instances/<instance ID>` for instance resources and `projects/<project ID>/instances/<instance ID>/databases/<database ID>` for database resources. (required)
-  body: object, The request body. (required)
+  resource: string, REQUIRED: The Cloud Spanner resource for which permissions are being tested. The format is `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;` for instance resources and `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;/databases/&lt;database ID&gt;` for database resources. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request message for `TestIamPermissions` method.