chore: regens API reference docs (#889)

diff --git a/docs/dyn/pubsub_v1.projects.subscriptions.html b/docs/dyn/pubsub_v1.projects.subscriptions.html
index 18b7f04..626bd82 100644
--- a/docs/dyn/pubsub_v1.projects.subscriptions.html
+++ b/docs/dyn/pubsub_v1.projects.subscriptions.html
@@ -75,10 +75,10 @@
 <h1><a href="pubsub_v1.html">Cloud Pub/Sub API</a> . <a href="pubsub_v1.projects.html">projects</a> . <a href="pubsub_v1.projects.subscriptions.html">subscriptions</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#acknowledge">acknowledge(subscription, body, x__xgafv=None)</a></code></p>
+  <code><a href="#acknowledge">acknowledge(subscription, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Acknowledges the messages associated with the `ack_ids` in the</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 a subscription to a given topic. See the</p>
 <p class="toc_element">
   <code><a href="#delete">delete(subscription, x__xgafv=None)</a></code></p>
@@ -87,7 +87,7 @@
   <code><a href="#get">get(subscription, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the configuration details of a subscription.</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>
@@ -96,29 +96,29 @@
   <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="#modifyAckDeadline">modifyAckDeadline(subscription, body, x__xgafv=None)</a></code></p>
+  <code><a href="#modifyAckDeadline">modifyAckDeadline(subscription, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Modifies the ack deadline for a specific message. This method is useful</p>
 <p class="toc_element">
-  <code><a href="#modifyPushConfig">modifyPushConfig(subscription, body, x__xgafv=None)</a></code></p>
+  <code><a href="#modifyPushConfig">modifyPushConfig(subscription, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Modifies the `PushConfig` for a specified subscription.</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 subscription. Note that certain properties of a</p>
 <p class="toc_element">
-  <code><a href="#pull">pull(subscription, body, x__xgafv=None)</a></code></p>
+  <code><a href="#pull">pull(subscription, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Pulls messages from the server. The server may return `UNAVAILABLE` if</p>
 <p class="toc_element">
-  <code><a href="#seek">seek(subscription, body, x__xgafv=None)</a></code></p>
+  <code><a href="#seek">seek(subscription, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Seeks an existing subscription to a point in time or to a given snapshot,</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="acknowledge">acknowledge(subscription, body, x__xgafv=None)</code>
+    <code class="details" id="acknowledge">acknowledge(subscription, body=None, x__xgafv=None)</code>
   <pre>Acknowledges the messages associated with the `ack_ids` in the
 `AcknowledgeRequest`. The Pub/Sub system can remove the relevant messages
 from the subscription.
@@ -128,13 +128,13 @@
 than once will not result in an error.
 
 Args:
-  subscription: string, The subscription whose message is being acknowledged.
+  subscription: string, Required. The subscription whose message is being acknowledged.
 Format is `projects/{project}/subscriptions/{sub}`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the Acknowledge method.
-    "ackIds": [ # The acknowledgment ID for the messages being acknowledged that was returned
+    "ackIds": [ # Required. The acknowledgment ID for the messages being acknowledged that was returned
         # by the Pub/Sub system in the `Pull` response. Must not be empty.
       "A String",
     ],
@@ -161,10 +161,10 @@
 </div>
 
 <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 a subscription to a given topic. 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;.
 If the subscription already exists, returns `ALREADY_EXISTS`.
 If the corresponding topic doesn't exist, returns `NOT_FOUND`.
 
@@ -177,17 +177,17 @@
 for REST API requests, you must specify a name in the request.
 
 Args:
-  name: string, The name of the subscription. It must have the format
+  name: string, Required. The name of the subscription. It must have the format
 `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` 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 subscription resource.
-  "name": "A String", # The name of the subscription. It must have the format
+  "name": "A String", # Required. The name of the subscription. It must have the format
       # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
       # start with a letter, and contain only letters (`[A-Za-z]`), numbers
       # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
@@ -196,7 +196,7 @@
   "ackDeadlineSeconds": 42, # The approximate amount of time (on a best-effort basis) Pub/Sub waits for
       # the subscriber to acknowledge receipt before resending the message. In the
       # interval after the message is delivered and before it is acknowledged, it
-      # is considered to be <i>outstanding</i>. During that time period, the
+      # is considered to be &lt;i&gt;outstanding&lt;/i&gt;. During that time period, the
       # message will not be redelivered (on a best-effort basis).
       # 
       # For pull subscriptions, this value is used as the initial value for the ack
@@ -213,36 +213,13 @@
       # 
       # If the subscriber never acknowledges the message, the Pub/Sub
       # system will eventually redeliver the message.
-  "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",
   },
   "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
       # used to configure it. An empty `pushConfig` signifies that the subscriber
       # will pull and ack messages using API methods.
-    "attributes": { # Endpoint configuration attributes.
-        #
-        # Every endpoint has a set of API supported attributes that can be used to
-        # control different aspects of the message delivery.
-        #
-        # The currently supported attribute is `x-goog-version`, which you can
-        # use to change the format of the pushed message. This attribute
-        # indicates the version of the data expected by the endpoint. This
-        # controls the shape of the pushed message (i.e., its fields and metadata).
-        # The endpoint version is based on the version of the Pub/Sub API.
-        #
-        # If not present during the `CreateSubscription` call, it will default to
-        # the version of the API used to make such call. If not present during a
-        # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-        # calls will always return a valid version, even if the subscription was
-        # created without this attribute.
-        #
-        # The possible values for this attribute are:
-        #
-        # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-        # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-      "a_key": "A String",
-    },
     "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
         # `Authorization` header in the HTTP request for every pushed message.
         # [OpenID Connect
@@ -259,10 +236,33 @@
           # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
           # have the iam.serviceAccounts.actAs permission for the service account.
     },
+    "attributes": { # Endpoint configuration attributes that can be used to control different
+        # aspects of the message delivery.
+        #
+        # The only currently supported attribute is `x-goog-version`, which you can
+        # use to change the format of the pushed message. This attribute
+        # indicates the version of the data expected by the endpoint. This
+        # controls the shape of the pushed message (i.e., its fields and metadata).
+        #
+        # If not present during the `CreateSubscription` call, it will default to
+        # the version of the Pub/Sub API used to make such call. If not present in a
+        # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+        # calls will always return a valid version, even if the subscription was
+        # created without this attribute.
+        #
+        # The only supported values for the `x-goog-version` attribute are:
+        #
+        # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+        # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+        #
+        # For example:
+        # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+      "a_key": "A String",
+    },
     "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
         # For example, a Webhook endpoint might use "https://example.com/push".
   },
-  "topic": "A String", # The name of the topic from which this subscription is receiving messages.
+  "topic": "A String", # Required. The name of the topic from which this subscription is receiving messages.
       # Format is `projects/{project}/topics/{topic}`.
       # The value of this field will be `_deleted-topic_` if the topic has been
       # deleted.
@@ -276,9 +276,47 @@
       # messages are not expunged from the subscription's backlog, even if they are
       # acknowledged, until they fall out of the `message_retention_duration`
       # window. This must be true if you would like to
-      # <a
-      # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time">
-      # Seek to a timestamp</a>.
+      # &lt;a
+      # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time"&gt;
+      # Seek to a timestamp&lt;/a&gt;.
+  "deadLetterPolicy": { # Dead lettering is done on a best effort basis. The same message might be # A policy that specifies the conditions for dead lettering messages in
+      # this subscription. If dead_letter_policy is not set, dead lettering
+      # is disabled.
+      # 
+      # The Cloud Pub/Sub service account associated with this subscriptions's
+      # parent project (i.e.,
+      # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+      # permission to Acknowledge() messages on this subscription.
+      # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+      # API might be changed in backward-incompatible ways and is not recommended
+      # for production use. It is not subject to any SLA or deprecation policy.
+      # dead lettered multiple times.
+      #
+      # If validation on any of the fields fails at subscription creation/updation,
+      # the create/update subscription request will fail.
+    "deadLetterTopic": "A String", # The name of the topic to which dead letter messages should be published.
+        # Format is `projects/{project}/topics/{topic}`.The Cloud Pub/Sub service
+        # account associated with the enclosing subscription's parent project (i.e.,
+        # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+        # permission to Publish() to this topic.
+        #
+        # The operation will fail if the topic does not exist.
+        # Users should ensure that there is a subscription attached to this topic
+        # since messages published to a topic with no subscriptions are lost.
+    "maxDeliveryAttempts": 42, # The maximum number of delivery attempts for any message. The value must be
+        # between 5 and 100.
+        #
+        # The number of delivery attempts is defined as 1 + (the sum of number of
+        # NACKs and number of times the acknowledgement deadline has been exceeded
+        # for the message).
+        #
+        # A NACK is any call to ModifyAckDeadline with a 0 deadline. Note that
+        # client libraries may automatically extend ack_deadlines.
+        #
+        # This field will be honored on a best effort basis.
+        #
+        # If this parameter is 0, a default value of 5 is used.
+  },
   "expirationPolicy": { # A policy that specifies the conditions for resource expiration (i.e., # A policy that specifies the conditions for this subscription's expiration.
       # A subscription is considered active as long as any connected subscriber is
       # successfully consuming messages from the subscription or is issuing
@@ -304,7 +342,7 @@
   An object of the form:
 
     { # A subscription resource.
-    "name": "A String", # The name of the subscription. It must have the format
+    "name": "A String", # Required. The name of the subscription. It must have the format
         # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
         # start with a letter, and contain only letters (`[A-Za-z]`), numbers
         # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
@@ -313,7 +351,7 @@
     "ackDeadlineSeconds": 42, # The approximate amount of time (on a best-effort basis) Pub/Sub waits for
         # the subscriber to acknowledge receipt before resending the message. In the
         # interval after the message is delivered and before it is acknowledged, it
-        # is considered to be <i>outstanding</i>. During that time period, the
+        # is considered to be &lt;i&gt;outstanding&lt;/i&gt;. During that time period, the
         # message will not be redelivered (on a best-effort basis).
         #
         # For pull subscriptions, this value is used as the initial value for the ack
@@ -330,36 +368,13 @@
         #
         # If the subscriber never acknowledges the message, the Pub/Sub
         # system will eventually redeliver the message.
-    "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",
     },
     "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
         # used to configure it. An empty `pushConfig` signifies that the subscriber
         # will pull and ack messages using API methods.
-      "attributes": { # Endpoint configuration attributes.
-          #
-          # Every endpoint has a set of API supported attributes that can be used to
-          # control different aspects of the message delivery.
-          #
-          # The currently supported attribute is `x-goog-version`, which you can
-          # use to change the format of the pushed message. This attribute
-          # indicates the version of the data expected by the endpoint. This
-          # controls the shape of the pushed message (i.e., its fields and metadata).
-          # The endpoint version is based on the version of the Pub/Sub API.
-          #
-          # If not present during the `CreateSubscription` call, it will default to
-          # the version of the API used to make such call. If not present during a
-          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-          # calls will always return a valid version, even if the subscription was
-          # created without this attribute.
-          #
-          # The possible values for this attribute are:
-          #
-          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-        "a_key": "A String",
-      },
       "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
           # `Authorization` header in the HTTP request for every pushed message.
           # [OpenID Connect
@@ -376,10 +391,33 @@
             # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
             # have the iam.serviceAccounts.actAs permission for the service account.
       },
+      "attributes": { # Endpoint configuration attributes that can be used to control different
+          # aspects of the message delivery.
+          #
+          # The only currently supported attribute is `x-goog-version`, which you can
+          # use to change the format of the pushed message. This attribute
+          # indicates the version of the data expected by the endpoint. This
+          # controls the shape of the pushed message (i.e., its fields and metadata).
+          #
+          # If not present during the `CreateSubscription` call, it will default to
+          # the version of the Pub/Sub API used to make such call. If not present in a
+          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+          # calls will always return a valid version, even if the subscription was
+          # created without this attribute.
+          #
+          # The only supported values for the `x-goog-version` attribute are:
+          #
+          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+          #
+          # For example:
+          # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+        "a_key": "A String",
+      },
       "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
           # For example, a Webhook endpoint might use "https://example.com/push".
     },
-    "topic": "A String", # The name of the topic from which this subscription is receiving messages.
+    "topic": "A String", # Required. The name of the topic from which this subscription is receiving messages.
         # Format is `projects/{project}/topics/{topic}`.
         # The value of this field will be `_deleted-topic_` if the topic has been
         # deleted.
@@ -393,9 +431,47 @@
         # messages are not expunged from the subscription's backlog, even if they are
         # acknowledged, until they fall out of the `message_retention_duration`
         # window. This must be true if you would like to
-        # <a
-        # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time">
-        # Seek to a timestamp</a>.
+        # &lt;a
+        # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time"&gt;
+        # Seek to a timestamp&lt;/a&gt;.
+    "deadLetterPolicy": { # Dead lettering is done on a best effort basis. The same message might be # A policy that specifies the conditions for dead lettering messages in
+        # this subscription. If dead_letter_policy is not set, dead lettering
+        # is disabled.
+        #
+        # The Cloud Pub/Sub service account associated with this subscriptions's
+        # parent project (i.e.,
+        # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+        # permission to Acknowledge() messages on this subscription.
+        # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+        # API might be changed in backward-incompatible ways and is not recommended
+        # for production use. It is not subject to any SLA or deprecation policy.
+        # dead lettered multiple times.
+        #
+        # If validation on any of the fields fails at subscription creation/updation,
+        # the create/update subscription request will fail.
+      "deadLetterTopic": "A String", # The name of the topic to which dead letter messages should be published.
+          # Format is `projects/{project}/topics/{topic}`.The Cloud Pub/Sub service
+          # account associated with the enclosing subscription's parent project (i.e.,
+          # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+          # permission to Publish() to this topic.
+          #
+          # The operation will fail if the topic does not exist.
+          # Users should ensure that there is a subscription attached to this topic
+          # since messages published to a topic with no subscriptions are lost.
+      "maxDeliveryAttempts": 42, # The maximum number of delivery attempts for any message. The value must be
+          # between 5 and 100.
+          #
+          # The number of delivery attempts is defined as 1 + (the sum of number of
+          # NACKs and number of times the acknowledgement deadline has been exceeded
+          # for the message).
+          #
+          # A NACK is any call to ModifyAckDeadline with a 0 deadline. Note that
+          # client libraries may automatically extend ack_deadlines.
+          #
+          # This field will be honored on a best effort basis.
+          #
+          # If this parameter is 0, a default value of 5 is used.
+    },
     "expirationPolicy": { # A policy that specifies the conditions for resource expiration (i.e., # A policy that specifies the conditions for this subscription's expiration.
         # A subscription is considered active as long as any connected subscriber is
         # successfully consuming messages from the subscription or is issuing
@@ -422,7 +498,7 @@
 subscription or its topic unless the same topic is specified.
 
 Args:
-  subscription: string, The subscription to delete.
+  subscription: string, Required. The subscription to delete.
 Format is `projects/{project}/subscriptions/{sub}`. (required)
   x__xgafv: string, V1 error format.
     Allowed values
@@ -449,7 +525,7 @@
   <pre>Gets the configuration details of a subscription.
 
 Args:
-  subscription: string, The name of the subscription to get.
+  subscription: string, Required. The name of the subscription to get.
 Format is `projects/{project}/subscriptions/{sub}`. (required)
   x__xgafv: string, V1 error format.
     Allowed values
@@ -460,7 +536,7 @@
   An object of the form:
 
     { # A subscription resource.
-    "name": "A String", # The name of the subscription. It must have the format
+    "name": "A String", # Required. The name of the subscription. It must have the format
         # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
         # start with a letter, and contain only letters (`[A-Za-z]`), numbers
         # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
@@ -469,7 +545,7 @@
     "ackDeadlineSeconds": 42, # The approximate amount of time (on a best-effort basis) Pub/Sub waits for
         # the subscriber to acknowledge receipt before resending the message. In the
         # interval after the message is delivered and before it is acknowledged, it
-        # is considered to be <i>outstanding</i>. During that time period, the
+        # is considered to be &lt;i&gt;outstanding&lt;/i&gt;. During that time period, the
         # message will not be redelivered (on a best-effort basis).
         #
         # For pull subscriptions, this value is used as the initial value for the ack
@@ -486,36 +562,13 @@
         #
         # If the subscriber never acknowledges the message, the Pub/Sub
         # system will eventually redeliver the message.
-    "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",
     },
     "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
         # used to configure it. An empty `pushConfig` signifies that the subscriber
         # will pull and ack messages using API methods.
-      "attributes": { # Endpoint configuration attributes.
-          #
-          # Every endpoint has a set of API supported attributes that can be used to
-          # control different aspects of the message delivery.
-          #
-          # The currently supported attribute is `x-goog-version`, which you can
-          # use to change the format of the pushed message. This attribute
-          # indicates the version of the data expected by the endpoint. This
-          # controls the shape of the pushed message (i.e., its fields and metadata).
-          # The endpoint version is based on the version of the Pub/Sub API.
-          #
-          # If not present during the `CreateSubscription` call, it will default to
-          # the version of the API used to make such call. If not present during a
-          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-          # calls will always return a valid version, even if the subscription was
-          # created without this attribute.
-          #
-          # The possible values for this attribute are:
-          #
-          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-        "a_key": "A String",
-      },
       "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
           # `Authorization` header in the HTTP request for every pushed message.
           # [OpenID Connect
@@ -532,10 +585,33 @@
             # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
             # have the iam.serviceAccounts.actAs permission for the service account.
       },
+      "attributes": { # Endpoint configuration attributes that can be used to control different
+          # aspects of the message delivery.
+          #
+          # The only currently supported attribute is `x-goog-version`, which you can
+          # use to change the format of the pushed message. This attribute
+          # indicates the version of the data expected by the endpoint. This
+          # controls the shape of the pushed message (i.e., its fields and metadata).
+          #
+          # If not present during the `CreateSubscription` call, it will default to
+          # the version of the Pub/Sub API used to make such call. If not present in a
+          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+          # calls will always return a valid version, even if the subscription was
+          # created without this attribute.
+          #
+          # The only supported values for the `x-goog-version` attribute are:
+          #
+          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+          #
+          # For example:
+          # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+        "a_key": "A String",
+      },
       "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
           # For example, a Webhook endpoint might use "https://example.com/push".
     },
-    "topic": "A String", # The name of the topic from which this subscription is receiving messages.
+    "topic": "A String", # Required. The name of the topic from which this subscription is receiving messages.
         # Format is `projects/{project}/topics/{topic}`.
         # The value of this field will be `_deleted-topic_` if the topic has been
         # deleted.
@@ -549,9 +625,47 @@
         # messages are not expunged from the subscription's backlog, even if they are
         # acknowledged, until they fall out of the `message_retention_duration`
         # window. This must be true if you would like to
-        # <a
-        # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time">
-        # Seek to a timestamp</a>.
+        # &lt;a
+        # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time"&gt;
+        # Seek to a timestamp&lt;/a&gt;.
+    "deadLetterPolicy": { # Dead lettering is done on a best effort basis. The same message might be # A policy that specifies the conditions for dead lettering messages in
+        # this subscription. If dead_letter_policy is not set, dead lettering
+        # is disabled.
+        #
+        # The Cloud Pub/Sub service account associated with this subscriptions's
+        # parent project (i.e.,
+        # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+        # permission to Acknowledge() messages on this subscription.
+        # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+        # API might be changed in backward-incompatible ways and is not recommended
+        # for production use. It is not subject to any SLA or deprecation policy.
+        # dead lettered multiple times.
+        #
+        # If validation on any of the fields fails at subscription creation/updation,
+        # the create/update subscription request will fail.
+      "deadLetterTopic": "A String", # The name of the topic to which dead letter messages should be published.
+          # Format is `projects/{project}/topics/{topic}`.The Cloud Pub/Sub service
+          # account associated with the enclosing subscription's parent project (i.e.,
+          # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+          # permission to Publish() to this topic.
+          #
+          # The operation will fail if the topic does not exist.
+          # Users should ensure that there is a subscription attached to this topic
+          # since messages published to a topic with no subscriptions are lost.
+      "maxDeliveryAttempts": 42, # The maximum number of delivery attempts for any message. The value must be
+          # between 5 and 100.
+          #
+          # The number of delivery attempts is defined as 1 + (the sum of number of
+          # NACKs and number of times the acknowledgement deadline has been exceeded
+          # for the message).
+          #
+          # A NACK is any call to ModifyAckDeadline with a 0 deadline. Note that
+          # client libraries may automatically extend ack_deadlines.
+          #
+          # This field will be honored on a best effort basis.
+          #
+          # If this parameter is 0, a default value of 5 is used.
+    },
     "expirationPolicy": { # A policy that specifies the conditions for resource expiration (i.e., # A policy that specifies the conditions for this subscription's expiration.
         # A subscription is considered active as long as any connected subscriber is
         # successfully consuming messages from the subscription or is issuing
@@ -570,7 +684,7 @@
 </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.
@@ -578,6 +692,14 @@
 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
@@ -586,53 +708,72 @@
 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`.
@@ -646,7 +787,7 @@
             #    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
@@ -655,36 +796,78 @@
             # * `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
@@ -693,8 +876,31 @@
         # 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>
 
@@ -703,7 +909,7 @@
   <pre>Lists matching subscriptions.
 
 Args:
-  project: string, The name of the project in which to list subscriptions.
+  project: string, Required. The name of the project in which to list subscriptions.
 Format is `projects/{project-id}`. (required)
   pageSize: integer, Maximum number of subscriptions to return.
   pageToken: string, The value returned by the last `ListSubscriptionsResponse`; indicates that
@@ -723,7 +929,7 @@
         # `ListSubscriptionsRequest` to get more subscriptions.
     "subscriptions": [ # The subscriptions that match the request.
       { # A subscription resource.
-        "name": "A String", # The name of the subscription. It must have the format
+        "name": "A String", # Required. The name of the subscription. It must have the format
             # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
             # start with a letter, and contain only letters (`[A-Za-z]`), numbers
             # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
@@ -732,7 +938,7 @@
         "ackDeadlineSeconds": 42, # The approximate amount of time (on a best-effort basis) Pub/Sub waits for
             # the subscriber to acknowledge receipt before resending the message. In the
             # interval after the message is delivered and before it is acknowledged, it
-            # is considered to be <i>outstanding</i>. During that time period, the
+            # is considered to be &lt;i&gt;outstanding&lt;/i&gt;. During that time period, the
             # message will not be redelivered (on a best-effort basis).
             #
             # For pull subscriptions, this value is used as the initial value for the ack
@@ -749,36 +955,13 @@
             #
             # If the subscriber never acknowledges the message, the Pub/Sub
             # system will eventually redeliver the message.
-        "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",
         },
         "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
             # used to configure it. An empty `pushConfig` signifies that the subscriber
             # will pull and ack messages using API methods.
-          "attributes": { # Endpoint configuration attributes.
-              #
-              # Every endpoint has a set of API supported attributes that can be used to
-              # control different aspects of the message delivery.
-              #
-              # The currently supported attribute is `x-goog-version`, which you can
-              # use to change the format of the pushed message. This attribute
-              # indicates the version of the data expected by the endpoint. This
-              # controls the shape of the pushed message (i.e., its fields and metadata).
-              # The endpoint version is based on the version of the Pub/Sub API.
-              #
-              # If not present during the `CreateSubscription` call, it will default to
-              # the version of the API used to make such call. If not present during a
-              # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-              # calls will always return a valid version, even if the subscription was
-              # created without this attribute.
-              #
-              # The possible values for this attribute are:
-              #
-              # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-              # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-            "a_key": "A String",
-          },
           "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
               # `Authorization` header in the HTTP request for every pushed message.
               # [OpenID Connect
@@ -795,10 +978,33 @@
                 # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
                 # have the iam.serviceAccounts.actAs permission for the service account.
           },
+          "attributes": { # Endpoint configuration attributes that can be used to control different
+              # aspects of the message delivery.
+              #
+              # The only currently supported attribute is `x-goog-version`, which you can
+              # use to change the format of the pushed message. This attribute
+              # indicates the version of the data expected by the endpoint. This
+              # controls the shape of the pushed message (i.e., its fields and metadata).
+              #
+              # If not present during the `CreateSubscription` call, it will default to
+              # the version of the Pub/Sub API used to make such call. If not present in a
+              # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+              # calls will always return a valid version, even if the subscription was
+              # created without this attribute.
+              #
+              # The only supported values for the `x-goog-version` attribute are:
+              #
+              # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+              # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+              #
+              # For example:
+              # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+            "a_key": "A String",
+          },
           "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
               # For example, a Webhook endpoint might use "https://example.com/push".
         },
-        "topic": "A String", # The name of the topic from which this subscription is receiving messages.
+        "topic": "A String", # Required. The name of the topic from which this subscription is receiving messages.
             # Format is `projects/{project}/topics/{topic}`.
             # The value of this field will be `_deleted-topic_` if the topic has been
             # deleted.
@@ -812,9 +1018,47 @@
             # messages are not expunged from the subscription's backlog, even if they are
             # acknowledged, until they fall out of the `message_retention_duration`
             # window. This must be true if you would like to
-            # <a
-            # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time">
-            # Seek to a timestamp</a>.
+            # &lt;a
+            # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time"&gt;
+            # Seek to a timestamp&lt;/a&gt;.
+        "deadLetterPolicy": { # Dead lettering is done on a best effort basis. The same message might be # A policy that specifies the conditions for dead lettering messages in
+            # this subscription. If dead_letter_policy is not set, dead lettering
+            # is disabled.
+            #
+            # The Cloud Pub/Sub service account associated with this subscriptions's
+            # parent project (i.e.,
+            # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+            # permission to Acknowledge() messages on this subscription.
+            # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+            # API might be changed in backward-incompatible ways and is not recommended
+            # for production use. It is not subject to any SLA or deprecation policy.
+            # dead lettered multiple times.
+            #
+            # If validation on any of the fields fails at subscription creation/updation,
+            # the create/update subscription request will fail.
+          "deadLetterTopic": "A String", # The name of the topic to which dead letter messages should be published.
+              # Format is `projects/{project}/topics/{topic}`.The Cloud Pub/Sub service
+              # account associated with the enclosing subscription's parent project (i.e.,
+              # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+              # permission to Publish() to this topic.
+              #
+              # The operation will fail if the topic does not exist.
+              # Users should ensure that there is a subscription attached to this topic
+              # since messages published to a topic with no subscriptions are lost.
+          "maxDeliveryAttempts": 42, # The maximum number of delivery attempts for any message. The value must be
+              # between 5 and 100.
+              #
+              # The number of delivery attempts is defined as 1 + (the sum of number of
+              # NACKs and number of times the acknowledgement deadline has been exceeded
+              # for the message).
+              #
+              # A NACK is any call to ModifyAckDeadline with a 0 deadline. Note that
+              # client libraries may automatically extend ack_deadlines.
+              #
+              # This field will be honored on a best effort basis.
+              #
+              # If this parameter is 0, a default value of 5 is used.
+        },
         "expirationPolicy": { # A policy that specifies the conditions for resource expiration (i.e., # A policy that specifies the conditions for this subscription's expiration.
             # A subscription is considered active as long as any connected subscriber is
             # successfully consuming messages from the subscription or is issuing
@@ -849,7 +1093,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="modifyAckDeadline">modifyAckDeadline(subscription, body, x__xgafv=None)</code>
+    <code class="details" id="modifyAckDeadline">modifyAckDeadline(subscription, body=None, x__xgafv=None)</code>
   <pre>Modifies the ack deadline for a specific message. This method is useful
 to indicate that more time is needed to process a message by the
 subscriber, or to make the message available for redelivery if the
@@ -857,13 +1101,13 @@
 subscription-level `ackDeadlineSeconds` used for subsequent messages.
 
 Args:
-  subscription: string, The name of the subscription.
+  subscription: string, Required. The name of the subscription.
 Format is `projects/{project}/subscriptions/{sub}`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the ModifyAckDeadline method.
-    "ackDeadlineSeconds": 42, # The new ack deadline with respect to the time this request was sent to
+    "ackDeadlineSeconds": 42, # Required. The new ack deadline with respect to the time this request was sent to
         # the Pub/Sub system. For example, if the value is 10, the new
         # ack deadline will expire 10 seconds after the `ModifyAckDeadline` call
         # was made. Specifying zero might immediately make the message available for
@@ -871,7 +1115,7 @@
         # increase in the rate of message redeliveries (that is, duplicates).
         # The minimum deadline you can specify is 0 seconds.
         # The maximum deadline you can specify is 600 seconds (10 minutes).
-    "ackIds": [ # List of acknowledgment IDs.
+    "ackIds": [ # Required. List of acknowledgment IDs.
       "A String",
     ],
   }
@@ -897,7 +1141,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="modifyPushConfig">modifyPushConfig(subscription, body, x__xgafv=None)</code>
+    <code class="details" id="modifyPushConfig">modifyPushConfig(subscription, body=None, x__xgafv=None)</code>
   <pre>Modifies the `PushConfig` for a specified subscription.
 
 This may be used to change a push subscription to a pull one (signified by
@@ -906,41 +1150,18 @@
 continuously through the call regardless of changes to the `PushConfig`.
 
 Args:
-  subscription: string, The name of the subscription.
+  subscription: string, Required. The name of the subscription.
 Format is `projects/{project}/subscriptions/{sub}`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the ModifyPushConfig method.
-    "pushConfig": { # Configuration for a push delivery endpoint. # The push configuration for future deliveries.
+    "pushConfig": { # Configuration for a push delivery endpoint. # Required. The push configuration for future deliveries.
         # 
         # An empty `pushConfig` indicates that the Pub/Sub system should
         # stop pushing messages from the given subscription and allow
         # messages to be pulled and acknowledged - effectively pausing
         # the subscription if `Pull` or `StreamingPull` is not called.
-      "attributes": { # Endpoint configuration attributes.
-          #
-          # Every endpoint has a set of API supported attributes that can be used to
-          # control different aspects of the message delivery.
-          #
-          # The currently supported attribute is `x-goog-version`, which you can
-          # use to change the format of the pushed message. This attribute
-          # indicates the version of the data expected by the endpoint. This
-          # controls the shape of the pushed message (i.e., its fields and metadata).
-          # The endpoint version is based on the version of the Pub/Sub API.
-          #
-          # If not present during the `CreateSubscription` call, it will default to
-          # the version of the API used to make such call. If not present during a
-          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-          # calls will always return a valid version, even if the subscription was
-          # created without this attribute.
-          #
-          # The possible values for this attribute are:
-          #
-          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-        "a_key": "A String",
-      },
       "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
           # `Authorization` header in the HTTP request for every pushed message.
           # [OpenID Connect
@@ -957,6 +1178,29 @@
             # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
             # have the iam.serviceAccounts.actAs permission for the service account.
       },
+      "attributes": { # Endpoint configuration attributes that can be used to control different
+          # aspects of the message delivery.
+          #
+          # The only currently supported attribute is `x-goog-version`, which you can
+          # use to change the format of the pushed message. This attribute
+          # indicates the version of the data expected by the endpoint. This
+          # controls the shape of the pushed message (i.e., its fields and metadata).
+          #
+          # If not present during the `CreateSubscription` call, it will default to
+          # the version of the Pub/Sub API used to make such call. If not present in a
+          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+          # calls will always return a valid version, even if the subscription was
+          # created without this attribute.
+          #
+          # The only supported values for the `x-goog-version` attribute are:
+          #
+          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+          #
+          # For example:
+          # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+        "a_key": "A String",
+      },
       "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
           # For example, a Webhook endpoint might use "https://example.com/push".
     },
@@ -983,25 +1227,25 @@
 </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 subscription. Note that certain properties of a
 subscription, such as its topic, are not modifiable.
 
 Args:
-  name: string, The name of the subscription. It must have the format
+  name: string, Required. The name of the subscription. It must have the format
 `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` 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 UpdateSubscription method.
-    "updateMask": "A String", # Indicates which fields in the provided subscription to update.
+    "updateMask": "A String", # Required. Indicates which fields in the provided subscription to update.
         # Must be specified and non-empty.
-    "subscription": { # A subscription resource. # The updated subscription object.
-      "name": "A String", # The name of the subscription. It must have the format
+    "subscription": { # A subscription resource. # Required. The updated subscription object.
+      "name": "A String", # Required. The name of the subscription. It must have the format
           # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
           # start with a letter, and contain only letters (`[A-Za-z]`), numbers
           # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
@@ -1010,7 +1254,7 @@
       "ackDeadlineSeconds": 42, # The approximate amount of time (on a best-effort basis) Pub/Sub waits for
           # the subscriber to acknowledge receipt before resending the message. In the
           # interval after the message is delivered and before it is acknowledged, it
-          # is considered to be <i>outstanding</i>. During that time period, the
+          # is considered to be &lt;i&gt;outstanding&lt;/i&gt;. During that time period, the
           # message will not be redelivered (on a best-effort basis).
           #
           # For pull subscriptions, this value is used as the initial value for the ack
@@ -1027,36 +1271,13 @@
           #
           # If the subscriber never acknowledges the message, the Pub/Sub
           # system will eventually redeliver the message.
-      "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",
       },
       "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
           # used to configure it. An empty `pushConfig` signifies that the subscriber
           # will pull and ack messages using API methods.
-        "attributes": { # Endpoint configuration attributes.
-            #
-            # Every endpoint has a set of API supported attributes that can be used to
-            # control different aspects of the message delivery.
-            #
-            # The currently supported attribute is `x-goog-version`, which you can
-            # use to change the format of the pushed message. This attribute
-            # indicates the version of the data expected by the endpoint. This
-            # controls the shape of the pushed message (i.e., its fields and metadata).
-            # The endpoint version is based on the version of the Pub/Sub API.
-            #
-            # If not present during the `CreateSubscription` call, it will default to
-            # the version of the API used to make such call. If not present during a
-            # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-            # calls will always return a valid version, even if the subscription was
-            # created without this attribute.
-            #
-            # The possible values for this attribute are:
-            #
-            # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-            # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-          "a_key": "A String",
-        },
         "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
             # `Authorization` header in the HTTP request for every pushed message.
             # [OpenID Connect
@@ -1073,10 +1294,33 @@
               # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
               # have the iam.serviceAccounts.actAs permission for the service account.
         },
+        "attributes": { # Endpoint configuration attributes that can be used to control different
+            # aspects of the message delivery.
+            #
+            # The only currently supported attribute is `x-goog-version`, which you can
+            # use to change the format of the pushed message. This attribute
+            # indicates the version of the data expected by the endpoint. This
+            # controls the shape of the pushed message (i.e., its fields and metadata).
+            #
+            # If not present during the `CreateSubscription` call, it will default to
+            # the version of the Pub/Sub API used to make such call. If not present in a
+            # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+            # calls will always return a valid version, even if the subscription was
+            # created without this attribute.
+            #
+            # The only supported values for the `x-goog-version` attribute are:
+            #
+            # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+            # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+            #
+            # For example:
+            # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+          "a_key": "A String",
+        },
         "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
             # For example, a Webhook endpoint might use "https://example.com/push".
       },
-      "topic": "A String", # The name of the topic from which this subscription is receiving messages.
+      "topic": "A String", # Required. The name of the topic from which this subscription is receiving messages.
           # Format is `projects/{project}/topics/{topic}`.
           # The value of this field will be `_deleted-topic_` if the topic has been
           # deleted.
@@ -1090,9 +1334,47 @@
           # messages are not expunged from the subscription's backlog, even if they are
           # acknowledged, until they fall out of the `message_retention_duration`
           # window. This must be true if you would like to
-          # <a
-          # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time">
-          # Seek to a timestamp</a>.
+          # &lt;a
+          # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time"&gt;
+          # Seek to a timestamp&lt;/a&gt;.
+      "deadLetterPolicy": { # Dead lettering is done on a best effort basis. The same message might be # A policy that specifies the conditions for dead lettering messages in
+          # this subscription. If dead_letter_policy is not set, dead lettering
+          # is disabled.
+          #
+          # The Cloud Pub/Sub service account associated with this subscriptions's
+          # parent project (i.e.,
+          # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+          # permission to Acknowledge() messages on this subscription.
+          # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+          # API might be changed in backward-incompatible ways and is not recommended
+          # for production use. It is not subject to any SLA or deprecation policy.
+          # dead lettered multiple times.
+          #
+          # If validation on any of the fields fails at subscription creation/updation,
+          # the create/update subscription request will fail.
+        "deadLetterTopic": "A String", # The name of the topic to which dead letter messages should be published.
+            # Format is `projects/{project}/topics/{topic}`.The Cloud Pub/Sub service
+            # account associated with the enclosing subscription's parent project (i.e.,
+            # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+            # permission to Publish() to this topic.
+            #
+            # The operation will fail if the topic does not exist.
+            # Users should ensure that there is a subscription attached to this topic
+            # since messages published to a topic with no subscriptions are lost.
+        "maxDeliveryAttempts": 42, # The maximum number of delivery attempts for any message. The value must be
+            # between 5 and 100.
+            #
+            # The number of delivery attempts is defined as 1 + (the sum of number of
+            # NACKs and number of times the acknowledgement deadline has been exceeded
+            # for the message).
+            #
+            # A NACK is any call to ModifyAckDeadline with a 0 deadline. Note that
+            # client libraries may automatically extend ack_deadlines.
+            #
+            # This field will be honored on a best effort basis.
+            #
+            # If this parameter is 0, a default value of 5 is used.
+      },
       "expirationPolicy": { # A policy that specifies the conditions for resource expiration (i.e., # A policy that specifies the conditions for this subscription's expiration.
           # A subscription is considered active as long as any connected subscriber is
           # successfully consuming messages from the subscription or is issuing
@@ -1119,7 +1401,7 @@
   An object of the form:
 
     { # A subscription resource.
-    "name": "A String", # The name of the subscription. It must have the format
+    "name": "A String", # Required. The name of the subscription. It must have the format
         # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
         # start with a letter, and contain only letters (`[A-Za-z]`), numbers
         # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
@@ -1128,7 +1410,7 @@
     "ackDeadlineSeconds": 42, # The approximate amount of time (on a best-effort basis) Pub/Sub waits for
         # the subscriber to acknowledge receipt before resending the message. In the
         # interval after the message is delivered and before it is acknowledged, it
-        # is considered to be <i>outstanding</i>. During that time period, the
+        # is considered to be &lt;i&gt;outstanding&lt;/i&gt;. During that time period, the
         # message will not be redelivered (on a best-effort basis).
         #
         # For pull subscriptions, this value is used as the initial value for the ack
@@ -1145,36 +1427,13 @@
         #
         # If the subscriber never acknowledges the message, the Pub/Sub
         # system will eventually redeliver the message.
-    "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",
     },
     "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
         # used to configure it. An empty `pushConfig` signifies that the subscriber
         # will pull and ack messages using API methods.
-      "attributes": { # Endpoint configuration attributes.
-          #
-          # Every endpoint has a set of API supported attributes that can be used to
-          # control different aspects of the message delivery.
-          #
-          # The currently supported attribute is `x-goog-version`, which you can
-          # use to change the format of the pushed message. This attribute
-          # indicates the version of the data expected by the endpoint. This
-          # controls the shape of the pushed message (i.e., its fields and metadata).
-          # The endpoint version is based on the version of the Pub/Sub API.
-          #
-          # If not present during the `CreateSubscription` call, it will default to
-          # the version of the API used to make such call. If not present during a
-          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
-          # calls will always return a valid version, even if the subscription was
-          # created without this attribute.
-          #
-          # The possible values for this attribute are:
-          #
-          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
-          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
-        "a_key": "A String",
-      },
       "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
           # `Authorization` header in the HTTP request for every pushed message.
           # [OpenID Connect
@@ -1191,10 +1450,33 @@
             # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
             # have the iam.serviceAccounts.actAs permission for the service account.
       },
+      "attributes": { # Endpoint configuration attributes that can be used to control different
+          # aspects of the message delivery.
+          #
+          # The only currently supported attribute is `x-goog-version`, which you can
+          # use to change the format of the pushed message. This attribute
+          # indicates the version of the data expected by the endpoint. This
+          # controls the shape of the pushed message (i.e., its fields and metadata).
+          #
+          # If not present during the `CreateSubscription` call, it will default to
+          # the version of the Pub/Sub API used to make such call. If not present in a
+          # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
+          # calls will always return a valid version, even if the subscription was
+          # created without this attribute.
+          #
+          # The only supported values for the `x-goog-version` attribute are:
+          #
+          # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
+          # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
+          #
+          # For example:
+          # &lt;pre&gt;&lt;code&gt;attributes { "x-goog-version": "v1" } &lt;/code&gt;&lt;/pre&gt;
+        "a_key": "A String",
+      },
       "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
           # For example, a Webhook endpoint might use "https://example.com/push".
     },
-    "topic": "A String", # The name of the topic from which this subscription is receiving messages.
+    "topic": "A String", # Required. The name of the topic from which this subscription is receiving messages.
         # Format is `projects/{project}/topics/{topic}`.
         # The value of this field will be `_deleted-topic_` if the topic has been
         # deleted.
@@ -1208,9 +1490,47 @@
         # messages are not expunged from the subscription's backlog, even if they are
         # acknowledged, until they fall out of the `message_retention_duration`
         # window. This must be true if you would like to
-        # <a
-        # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time">
-        # Seek to a timestamp</a>.
+        # &lt;a
+        # href="https://cloud.google.com/pubsub/docs/replay-overview#seek_to_a_time"&gt;
+        # Seek to a timestamp&lt;/a&gt;.
+    "deadLetterPolicy": { # Dead lettering is done on a best effort basis. The same message might be # A policy that specifies the conditions for dead lettering messages in
+        # this subscription. If dead_letter_policy is not set, dead lettering
+        # is disabled.
+        #
+        # The Cloud Pub/Sub service account associated with this subscriptions's
+        # parent project (i.e.,
+        # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+        # permission to Acknowledge() messages on this subscription.
+        # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+        # API might be changed in backward-incompatible ways and is not recommended
+        # for production use. It is not subject to any SLA or deprecation policy.
+        # dead lettered multiple times.
+        #
+        # If validation on any of the fields fails at subscription creation/updation,
+        # the create/update subscription request will fail.
+      "deadLetterTopic": "A String", # The name of the topic to which dead letter messages should be published.
+          # Format is `projects/{project}/topics/{topic}`.The Cloud Pub/Sub service
+          # account associated with the enclosing subscription's parent project (i.e.,
+          # service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have
+          # permission to Publish() to this topic.
+          #
+          # The operation will fail if the topic does not exist.
+          # Users should ensure that there is a subscription attached to this topic
+          # since messages published to a topic with no subscriptions are lost.
+      "maxDeliveryAttempts": 42, # The maximum number of delivery attempts for any message. The value must be
+          # between 5 and 100.
+          #
+          # The number of delivery attempts is defined as 1 + (the sum of number of
+          # NACKs and number of times the acknowledgement deadline has been exceeded
+          # for the message).
+          #
+          # A NACK is any call to ModifyAckDeadline with a 0 deadline. Note that
+          # client libraries may automatically extend ack_deadlines.
+          #
+          # This field will be honored on a best effort basis.
+          #
+          # If this parameter is 0, a default value of 5 is used.
+    },
     "expirationPolicy": { # A policy that specifies the conditions for resource expiration (i.e., # A policy that specifies the conditions for this subscription's expiration.
         # A subscription is considered active as long as any connected subscriber is
         # successfully consuming messages from the subscription or is issuing
@@ -1229,24 +1549,28 @@
 </div>
 
 <div class="method">
-    <code class="details" id="pull">pull(subscription, body, x__xgafv=None)</code>
+    <code class="details" id="pull">pull(subscription, body=None, x__xgafv=None)</code>
   <pre>Pulls messages from the server. The server may return `UNAVAILABLE` if
 there are too many concurrent pull requests pending for the given
 subscription.
 
 Args:
-  subscription: string, The subscription from which messages should be pulled.
+  subscription: string, Required. The subscription from which messages should be pulled.
 Format is `projects/{project}/subscriptions/{sub}`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the `Pull` method.
-    "returnImmediately": True or False, # If this field set to true, the system will respond immediately even if
+    "returnImmediately": True or False, # Optional. If this field set to true, the system will respond immediately even if
         # it there are no messages available to return in the `Pull` response.
         # Otherwise, the system may wait (for a bounded amount of time) until at
-        # least one message is available, rather than returning no messages.
-    "maxMessages": 42, # The maximum number of messages returned for this request. The Pub/Sub
-        # system may return fewer than the number specified.
+        # least one message is available, rather than returning no messages. Warning:
+        # setting this field to `true` is discouraged because it adversely impacts
+        # the performance of `Pull` operations. We recommend that users do not set
+        # this field.
+    "maxMessages": 42, # Required. The maximum number of messages to return for this request. Must be a
+        # positive integer. The Pub/Sub system may return fewer than the number
+        # specified.
   }
 
   x__xgafv: string, V1 error format.
@@ -1268,11 +1592,12 @@
             # 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
@@ -1285,16 +1610,32 @@
               # subscriber that receives a `PubsubMessage` via a `Pull` call or a push
               # delivery. It must not be populated by the publisher in a `Publish` call.
         },
+        "deliveryAttempt": 42, # Delivery attempt counter is 1 + (the sum of number of NACKs and number of
+            # ack_deadline exceeds) for this message.
+            #
+            # A NACK is any call to ModifyAckDeadline with a 0 deadline. An ack_deadline
+            # exceeds event is whenever a message is not acknowledged within
+            # ack_deadline. Note that ack_deadline is initially
+            # Subscription.ackDeadlineSeconds, but may get extended automatically by
+            # the client library.
+            #
+            # The first delivery of a given message will have this value as 1. The value
+            # is calculated at best effort and is approximate.
+            #
+            # If a DeadLetterPolicy is not set on the subscription, this will be 0.
+            # &lt;b&gt;EXPERIMENTAL:&lt;/b&gt; This feature is part of a closed alpha release. This
+            # API might be changed in backward-incompatible ways and is not recommended
+            # for production use. It is not subject to any SLA or deprecation policy.
       },
     ],
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="seek">seek(subscription, body, x__xgafv=None)</code>
+    <code class="details" id="seek">seek(subscription, body=None, x__xgafv=None)</code>
   <pre>Seeks an existing subscription to a point in time or to a given snapshot,
 whichever is provided in the request. Snapshots are used in
-<a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+&lt;a href="https://cloud.google.com/pubsub/docs/replay-overview"&gt;Seek&lt;/a&gt;
 operations, which allow
 you to manage message acknowledgments in bulk. That is, you can set the
 acknowledgment state of messages in an existing subscription to the state
@@ -1302,8 +1643,8 @@
 must be on the same topic.
 
 Args:
-  subscription: string, The subscription to affect. (required)
-  body: object, The request body. (required)
+  subscription: string, Required. The subscription to affect. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the `Seek` method.
@@ -1336,67 +1677,88 @@
 </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`.
@@ -1410,7 +1772,7 @@
               #    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
@@ -1419,36 +1781,78 @@
               # * `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
@@ -1457,8 +1861,31 @@
           # 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.
     },
   }
 
@@ -1470,53 +1897,72 @@
 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`.
@@ -1530,7 +1976,7 @@
             #    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
@@ -1539,36 +1985,78 @@
             # * `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
@@ -1577,13 +2065,36 @@
         # 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.
@@ -1595,7 +2106,7 @@
 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.