chore: regens API reference docs (#889)

diff --git a/docs/dyn/pubsub_v1.projects.topics.html b/docs/dyn/pubsub_v1.projects.topics.html
index 56f0dbf..cf4aa46 100644
--- a/docs/dyn/pubsub_v1.projects.topics.html
+++ b/docs/dyn/pubsub_v1.projects.topics.html
@@ -85,7 +85,7 @@
 <p class="firstline">Returns the subscriptions Resource.</p>
 
 <p class="toc_element">
-  <code><a href="#create">create(name, body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(name, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates the given topic with the given name. See the</p>
 <p class="toc_element">
   <code><a href="#delete">delete(topic, x__xgafv=None)</a></code></p>
@@ -94,7 +94,7 @@
   <code><a href="#get">get(topic, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the configuration of a topic.</p>
 <p class="toc_element">
-  <code><a href="#getIamPolicy">getIamPolicy(resource, x__xgafv=None)</a></code></p>
+  <code><a href="#getIamPolicy">getIamPolicy(resource, options_requestedPolicyVersion=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the access control policy for a resource.</p>
 <p class="toc_element">
   <code><a href="#list">list(project, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
@@ -103,57 +103,53 @@
   <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 existing topic. Note that certain properties of a</p>
 <p class="toc_element">
-  <code><a href="#publish">publish(topic, body, x__xgafv=None)</a></code></p>
+  <code><a href="#publish">publish(topic, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Adds one or more messages to the topic. Returns `NOT_FOUND` if the topic</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 the specified 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 a caller has on the specified resource.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(name, body, x__xgafv=None)</code>
+    <code class="details" id="create">create(name, body=None, x__xgafv=None)</code>
   <pre>Creates the given topic with the given name. See the
-<a href="https://cloud.google.com/pubsub/docs/admin#resource_names">
-resource name rules</a>.
+&lt;a href="https://cloud.google.com/pubsub/docs/admin#resource_names"&gt;
+resource name rules&lt;/a&gt;.
 
 Args:
-  name: string, The name of the topic. It must have the format
+  name: string, Required. The name of the topic. It must have the format
 `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
 and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
 underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
 signs (`%`). It must be between 3 and 255 characters in length, and it
 must not start with `"goog"`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A topic resource.
-  "labels": { # See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-      # managing labels</a>.
+  "labels": { # See &lt;a href="https://cloud.google.com/pubsub/docs/labels"&gt; Creating and
+      # managing labels&lt;/a&gt;.
     "a_key": "A String",
   },
-  "name": "A String", # The name of the topic. It must have the format
+  "name": "A String", # Required. The name of the topic. It must have the format
       # `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
       # and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
       # underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
       # signs (`%`). It must be between 3 and 255 characters in length, and it
       # must not start with `"goog"`.
-  "messageStoragePolicy": { # Policy constraining how messages published to the topic may be stored. It
-      # is determined when the topic is created based on the policy configured at
-      # the project level. It must not be set by the caller in the request to
-      # CreateTopic or to UpdateTopic. This field will be populated in the
-      # responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the
-      # response, then no constraints are in effect.
-    "allowedPersistenceRegions": [ # The list of GCP region IDs where messages that are published to the topic
+  "messageStoragePolicy": { # Policy constraining the set of Google Cloud Platform regions where messages
+      # published to the topic may be stored. If not present, then no constraints
+      # are in effect.
+    "allowedPersistenceRegions": [ # A list of IDs of GCP regions where messages that are published to the topic
         # may be persisted in storage. Messages published by publishers running in
         # non-allowed GCP regions (or running outside of GCP altogether) will be
-        # routed for storage in one of the allowed regions. An empty list indicates a
-        # misconfiguration at the project or organization level, which will result in
-        # all Publish operations failing.
+        # routed for storage in one of the allowed regions. An empty list means that
+        # no regions are allowed, and is not a valid configuration.
       "A String",
     ],
   },
@@ -172,28 +168,24 @@
   An object of the form:
 
     { # A topic resource.
-    "labels": { # See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-        # managing labels</a>.
+    "labels": { # See &lt;a href="https://cloud.google.com/pubsub/docs/labels"&gt; Creating and
+        # managing labels&lt;/a&gt;.
       "a_key": "A String",
     },
-    "name": "A String", # The name of the topic. It must have the format
+    "name": "A String", # Required. The name of the topic. It must have the format
         # `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
         # and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
         # underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
         # signs (`%`). It must be between 3 and 255 characters in length, and it
         # must not start with `"goog"`.
-    "messageStoragePolicy": { # Policy constraining how messages published to the topic may be stored. It
-        # is determined when the topic is created based on the policy configured at
-        # the project level. It must not be set by the caller in the request to
-        # CreateTopic or to UpdateTopic. This field will be populated in the
-        # responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the
-        # response, then no constraints are in effect.
-      "allowedPersistenceRegions": [ # The list of GCP region IDs where messages that are published to the topic
+    "messageStoragePolicy": { # Policy constraining the set of Google Cloud Platform regions where messages
+        # published to the topic may be stored. If not present, then no constraints
+        # are in effect.
+      "allowedPersistenceRegions": [ # A list of IDs of GCP regions where messages that are published to the topic
           # may be persisted in storage. Messages published by publishers running in
           # non-allowed GCP regions (or running outside of GCP altogether) will be
-          # routed for storage in one of the allowed regions. An empty list indicates a
-          # misconfiguration at the project or organization level, which will result in
-          # all Publish operations failing.
+          # routed for storage in one of the allowed regions. An empty list means that
+          # no regions are allowed, and is not a valid configuration.
         "A String",
       ],
     },
@@ -213,7 +205,7 @@
 not deleted, but their `topic` field is set to `_deleted-topic_`.
 
 Args:
-  topic: string, Name of the topic to delete.
+  topic: string, Required. Name of the topic to delete.
 Format is `projects/{project}/topics/{topic}`. (required)
   x__xgafv: string, V1 error format.
     Allowed values
@@ -240,7 +232,7 @@
   <pre>Gets the configuration of a topic.
 
 Args:
-  topic: string, The name of the topic to get.
+  topic: string, Required. The name of the topic to get.
 Format is `projects/{project}/topics/{topic}`. (required)
   x__xgafv: string, V1 error format.
     Allowed values
@@ -251,28 +243,24 @@
   An object of the form:
 
     { # A topic resource.
-    "labels": { # See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-        # managing labels</a>.
+    "labels": { # See &lt;a href="https://cloud.google.com/pubsub/docs/labels"&gt; Creating and
+        # managing labels&lt;/a&gt;.
       "a_key": "A String",
     },
-    "name": "A String", # The name of the topic. It must have the format
+    "name": "A String", # Required. The name of the topic. It must have the format
         # `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
         # and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
         # underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
         # signs (`%`). It must be between 3 and 255 characters in length, and it
         # must not start with `"goog"`.
-    "messageStoragePolicy": { # Policy constraining how messages published to the topic may be stored. It
-        # is determined when the topic is created based on the policy configured at
-        # the project level. It must not be set by the caller in the request to
-        # CreateTopic or to UpdateTopic. This field will be populated in the
-        # responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the
-        # response, then no constraints are in effect.
-      "allowedPersistenceRegions": [ # The list of GCP region IDs where messages that are published to the topic
+    "messageStoragePolicy": { # Policy constraining the set of Google Cloud Platform regions where messages
+        # published to the topic may be stored. If not present, then no constraints
+        # are in effect.
+      "allowedPersistenceRegions": [ # A list of IDs of GCP regions where messages that are published to the topic
           # may be persisted in storage. Messages published by publishers running in
           # non-allowed GCP regions (or running outside of GCP altogether) will be
-          # routed for storage in one of the allowed regions. An empty list indicates a
-          # misconfiguration at the project or organization level, which will result in
-          # all Publish operations failing.
+          # routed for storage in one of the allowed regions. An empty list means that
+          # no regions are allowed, and is not a valid configuration.
         "A String",
       ],
     },
@@ -284,7 +272,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="getIamPolicy">getIamPolicy(resource, x__xgafv=None)</code>
+    <code class="details" id="getIamPolicy">getIamPolicy(resource, options_requestedPolicyVersion=None, x__xgafv=None)</code>
   <pre>Gets the access control policy for a resource.
 Returns an empty policy if the resource exists and does not have a policy
 set.
@@ -292,6 +280,14 @@
 Args:
   resource: string, REQUIRED: The resource for which the policy is being requested.
 See the operation documentation for the appropriate value for this field. (required)
+  options_requestedPolicyVersion: integer, 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.
     Allowed values
       1 - v1 error format
@@ -300,53 +296,72 @@
 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`.
@@ -360,7 +375,7 @@
             #    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
@@ -369,36 +384,78 @@
             # * `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
-              # 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
+            # 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.
+          "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
+          "expression": "A String", # Textual representation of an expression in Common Expression Language
+              # syntax.
+          "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.
+          "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.
         },
       },
     ],
-    "version": 42, # Deprecated.
     "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
         # prevent simultaneous updates of a policy from overwriting each other.
         # It is strongly suggested that systems make use of the `etag` in the
@@ -407,8 +464,31 @@
         # 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.
+        # **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>
 
@@ -417,7 +497,7 @@
   <pre>Lists matching topics.
 
 Args:
-  project: string, The name of the project in which to list topics.
+  project: string, Required. The name of the project in which to list topics.
 Format is `projects/{project-id}`. (required)
   pageSize: integer, Maximum number of topics to return.
   pageToken: string, The value returned by the last `ListTopicsResponse`; indicates that this is
@@ -436,28 +516,24 @@
         # request; this value should be passed in a new `ListTopicsRequest`.
     "topics": [ # The resulting topics.
       { # A topic resource.
-        "labels": { # See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-            # managing labels</a>.
+        "labels": { # See &lt;a href="https://cloud.google.com/pubsub/docs/labels"&gt; Creating and
+            # managing labels&lt;/a&gt;.
           "a_key": "A String",
         },
-        "name": "A String", # The name of the topic. It must have the format
+        "name": "A String", # Required. The name of the topic. It must have the format
             # `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
             # and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
             # underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
             # signs (`%`). It must be between 3 and 255 characters in length, and it
             # must not start with `"goog"`.
-        "messageStoragePolicy": { # Policy constraining how messages published to the topic may be stored. It
-            # is determined when the topic is created based on the policy configured at
-            # the project level. It must not be set by the caller in the request to
-            # CreateTopic or to UpdateTopic. This field will be populated in the
-            # responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the
-            # response, then no constraints are in effect.
-          "allowedPersistenceRegions": [ # The list of GCP region IDs where messages that are published to the topic
+        "messageStoragePolicy": { # Policy constraining the set of Google Cloud Platform regions where messages
+            # published to the topic may be stored. If not present, then no constraints
+            # are in effect.
+          "allowedPersistenceRegions": [ # A list of IDs of GCP regions where messages that are published to the topic
               # may be persisted in storage. Messages published by publishers running in
               # non-allowed GCP regions (or running outside of GCP altogether) will be
-              # routed for storage in one of the allowed regions. An empty list indicates a
-              # misconfiguration at the project or organization level, which will result in
-              # all Publish operations failing.
+              # routed for storage in one of the allowed regions. An empty list means that
+              # no regions are allowed, and is not a valid configuration.
             "A String",
           ],
         },
@@ -485,44 +561,40 @@
 </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 existing topic. Note that certain properties of a
 topic are not modifiable.
 
 Args:
-  name: string, The name of the topic. It must have the format
+  name: string, Required. The name of the topic. It must have the format
 `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
 and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
 underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
 signs (`%`). It must be between 3 and 255 characters in length, and it
 must not start with `"goog"`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the UpdateTopic method.
-    "topic": { # A topic resource. # The updated topic object.
-      "labels": { # See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-          # managing labels</a>.
+    "topic": { # A topic resource. # Required. The updated topic object.
+      "labels": { # See &lt;a href="https://cloud.google.com/pubsub/docs/labels"&gt; Creating and
+          # managing labels&lt;/a&gt;.
         "a_key": "A String",
       },
-      "name": "A String", # The name of the topic. It must have the format
+      "name": "A String", # Required. The name of the topic. It must have the format
           # `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
           # and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
           # underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
           # signs (`%`). It must be between 3 and 255 characters in length, and it
           # must not start with `"goog"`.
-      "messageStoragePolicy": { # Policy constraining how messages published to the topic may be stored. It
-          # is determined when the topic is created based on the policy configured at
-          # the project level. It must not be set by the caller in the request to
-          # CreateTopic or to UpdateTopic. This field will be populated in the
-          # responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the
-          # response, then no constraints are in effect.
-        "allowedPersistenceRegions": [ # The list of GCP region IDs where messages that are published to the topic
+      "messageStoragePolicy": { # Policy constraining the set of Google Cloud Platform regions where messages
+          # published to the topic may be stored. If not present, then no constraints
+          # are in effect.
+        "allowedPersistenceRegions": [ # A list of IDs of GCP regions where messages that are published to the topic
             # may be persisted in storage. Messages published by publishers running in
             # non-allowed GCP regions (or running outside of GCP altogether) will be
-            # routed for storage in one of the allowed regions. An empty list indicates a
-            # misconfiguration at the project or organization level, which will result in
-            # all Publish operations failing.
+            # routed for storage in one of the allowed regions. An empty list means that
+            # no regions are allowed, and is not a valid configuration.
           "A String",
         ],
       },
@@ -531,11 +603,11 @@
           #
           # The expected format is `projects/*/locations/*/keyRings/*/cryptoKeys/*`.
     },
-    "updateMask": "A String", # Indicates which fields in the provided topic to update. Must be specified
+    "updateMask": "A String", # Required. Indicates which fields in the provided topic to update. Must be specified
         # and non-empty. Note that if `update_mask` contains
-        # "message_storage_policy" then the new value will be determined based on the
-        # policy configured at the project or organization level. The
-        # `message_storage_policy` must not be set in the `topic` provided above.
+        # "message_storage_policy" but the `message_storage_policy` is not set in
+        # the `topic` provided above, then the updated value is determined by the
+        # policy configured at the project or organization level.
   }
 
   x__xgafv: string, V1 error format.
@@ -547,28 +619,24 @@
   An object of the form:
 
     { # A topic resource.
-    "labels": { # See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-        # managing labels</a>.
+    "labels": { # See &lt;a href="https://cloud.google.com/pubsub/docs/labels"&gt; Creating and
+        # managing labels&lt;/a&gt;.
       "a_key": "A String",
     },
-    "name": "A String", # The name of the topic. It must have the format
+    "name": "A String", # Required. The name of the topic. It must have the format
         # `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter,
         # and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
         # underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
         # signs (`%`). It must be between 3 and 255 characters in length, and it
         # must not start with `"goog"`.
-    "messageStoragePolicy": { # Policy constraining how messages published to the topic may be stored. It
-        # is determined when the topic is created based on the policy configured at
-        # the project level. It must not be set by the caller in the request to
-        # CreateTopic or to UpdateTopic. This field will be populated in the
-        # responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the
-        # response, then no constraints are in effect.
-      "allowedPersistenceRegions": [ # The list of GCP region IDs where messages that are published to the topic
+    "messageStoragePolicy": { # Policy constraining the set of Google Cloud Platform regions where messages
+        # published to the topic may be stored. If not present, then no constraints
+        # are in effect.
+      "allowedPersistenceRegions": [ # A list of IDs of GCP regions where messages that are published to the topic
           # may be persisted in storage. Messages published by publishers running in
           # non-allowed GCP regions (or running outside of GCP altogether) will be
-          # routed for storage in one of the allowed regions. An empty list indicates a
-          # misconfiguration at the project or organization level, which will result in
-          # all Publish operations failing.
+          # routed for storage in one of the allowed regions. An empty list means that
+          # no regions are allowed, and is not a valid configuration.
         "A String",
       ],
     },
@@ -580,27 +648,28 @@
 </div>
 
 <div class="method">
-    <code class="details" id="publish">publish(topic, body, x__xgafv=None)</code>
+    <code class="details" id="publish">publish(topic, body=None, x__xgafv=None)</code>
   <pre>Adds one or more messages to the topic. Returns `NOT_FOUND` if the topic
 does not exist.
 
 Args:
-  topic: string, The messages in the request will be published on this topic.
+  topic: string, Required. The messages in the request will be published on this topic.
 Format is `projects/{project}/topics/{topic}`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the Publish method.
-    "messages": [ # The messages to publish.
+    "messages": [ # Required. The messages to publish.
       { # A message that is published by publishers and consumed by subscribers. The
           # message must contain either a non-empty data field or at least one attribute.
           # Note that client libraries represent this object differently
           # depending on the language. See the corresponding
-          # <a href="https://cloud.google.com/pubsub/docs/reference/libraries">client
-          # library documentation</a> for more information. See
-          # <a href="https://cloud.google.com/pubsub/quotas">Quotas and limits</a>
+          # &lt;a href="https://cloud.google.com/pubsub/docs/reference/libraries"&gt;client
+          # library documentation&lt;/a&gt; for more information. See
+          # &lt;a href="https://cloud.google.com/pubsub/quotas"&gt;Quotas and limits&lt;/a&gt;
           # for more information about message limits.
-        "attributes": { # Optional attributes for this message.
+        "attributes": { # Attributes for this message. If this field is empty, the message must
+            # contain non-empty data.
           "a_key": "A String",
         },
         "data": "A String", # The message data field. If this field is empty, the message must contain
@@ -634,67 +703,88 @@
 </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 the specified resource. Replaces any
 existing policy.
 
+Can return Public Errors: NOT_FOUND, INVALID_ARGUMENT and PERMISSION_DENIED
+
 Args:
   resource: string, REQUIRED: The resource for which the policy is being specified.
 See the operation documentation for the appropriate value for this field. (required)
-  body: object, The request body. (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`.
@@ -708,7 +798,7 @@
               #    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
@@ -717,36 +807,78 @@
               # * `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
-                # 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
+              # 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.
+            "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
+            "expression": "A String", # Textual representation of an expression in Common Expression Language
+                # syntax.
+            "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.
+            "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.
           },
         },
       ],
-      "version": 42, # Deprecated.
       "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
           # prevent simultaneous updates of a policy from overwriting each other.
           # It is strongly suggested that systems make use of the `etag` in the
@@ -755,8 +887,31 @@
           # 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.
+          # **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.
     },
   }
 
@@ -768,53 +923,72 @@
 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`.
@@ -828,7 +1002,7 @@
             #    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
@@ -837,36 +1011,78 @@
             # * `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
-              # 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
+            # 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.
+          "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
+          "expression": "A String", # Textual representation of an expression in Common Expression Language
+              # syntax.
+          "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.
+          "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.
         },
       },
     ],
-    "version": 42, # Deprecated.
     "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
         # prevent simultaneous updates of a policy from overwriting each other.
         # It is strongly suggested that systems make use of the `etag` in the
@@ -875,13 +1091,36 @@
         # 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.
+        # **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 a caller has on the specified resource.
 If the resource does not exist, this will return an empty set of
 permissions, not a NOT_FOUND error.
@@ -893,7 +1132,7 @@
 Args:
   resource: string, REQUIRED: The resource for which the policy detail is being requested.
 See the operation documentation for the appropriate value for this field. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request message for `TestIamPermissions` method.