diff --git a/pubsub/google/cloud/pubsub_v1/gapic/publisher_client.py b/pubsub/google/cloud/pubsub_v1/gapic/publisher_client.py
index 7c4da4ab6e01..d857be8d04e0 100644
--- a/pubsub/google/cloud/pubsub_v1/gapic/publisher_client.py
+++ b/pubsub/google/cloud/pubsub_v1/gapic/publisher_client.py
@@ -223,7 +223,8 @@ def create_topic(
                 underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
                 signs (`%`). It must be between 3 and 255 characters in length, and it
                 must not start with `"goog"`.
-            labels (dict[str -> str]): See <a href="/pubsub/docs/labels"> Creating and managing labels</a>.
+            labels (dict[str -> str]): See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
+                managing labels</a>.
             message_storage_policy (Union[dict, ~google.cloud.pubsub_v1.types.MessageStoragePolicy]): Policy constraining how messages published to the topic may be stored. It
                 is determined when the topic is created based on the policy configured at
                 the project level. It must not be set by the caller in the request to
diff --git a/pubsub/google/cloud/pubsub_v1/gapic/subscriber_client.py b/pubsub/google/cloud/pubsub_v1/gapic/subscriber_client.py
index 67375a9387c9..5c4dd174def6 100644
--- a/pubsub/google/cloud/pubsub_v1/gapic/subscriber_client.py
+++ b/pubsub/google/cloud/pubsub_v1/gapic/subscriber_client.py
@@ -237,9 +237,9 @@ def create_subscription(
         If the name is not provided in the request, the server will assign a
         random name for this subscription on the same project as the topic,
         conforming to the `resource name
-        format <https://cloud.google.com/pubsub/docs/overview#names>`__. The
-        generated name is populated in the returned Subscription object. Note
-        that for REST API requests, you must specify a name in the request.
+        format <https://cloud.google.com/pubsub/docs/admin#resource_names>`__.
+        The generated name is populated in the returned Subscription object.
+        Note that for REST API requests, you must specify a name in the request.
 
         Example:
             >>> from google.cloud import pubsub_v1
@@ -267,11 +267,11 @@ def create_subscription(
 
                 If a dict is provided, it must be of the same form as the protobuf
                 message :class:`~google.cloud.pubsub_v1.types.PushConfig`
-            ack_deadline_seconds (int): This value is the maximum time after a subscriber receives a message
-                before the subscriber should acknowledge the message. After message
-                delivery but before the ack deadline expires and before the message is
-                acknowledged, it is an outstanding message and will not be delivered
-                again during that time (on a best-effort basis).
+            ack_deadline_seconds (int): 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 outstanding. 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 deadline. To override this value for a given message, call
@@ -290,23 +290,25 @@ def create_subscription(
             retain_acked_messages (bool): Indicates whether to retain acknowledged messages. If true, then
                 messages are not expunged from the subscription's backlog, even if they
                 are acknowledged, until they fall out of the
-                ``message_retention_duration`` window. ALPHA: This feature is part of an
-                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.
+                ``message_retention_duration`` window. This must be true if you would
+                like to Seek to a timestamp. BETA: This feature is part of a beta
+                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.
             message_retention_duration (Union[dict, ~google.cloud.pubsub_v1.types.Duration]): How long to retain unacknowledged messages in the subscription's
                 backlog, from the moment a message is published. If
                 ``retain_acked_messages`` is true, then this also configures the
                 retention of acknowledged messages, and thus configures how far back in
                 time a ``Seek`` can be done. Defaults to 7 days. Cannot be more than 7
-                days or less than 10 minutes. ALPHA: This feature is part of an alpha
+                days or less than 10 minutes. BETA: This feature is part of a beta
                 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.
 
                 If a dict is provided, it must be of the same form as the protobuf
                 message :class:`~google.cloud.pubsub_v1.types.Duration`
-            labels (dict[str -> str]): See <a href="/pubsub/docs/labels"> Creating and managing labels</a>.
+            labels (dict[str -> str]): See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
+                managing labels</a>.
             expiration_policy (Union[dict, ~google.cloud.pubsub_v1.types.ExpirationPolicy]): 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
@@ -680,9 +682,11 @@ def modify_ack_deadline(
             ack_deadline_seconds (int): 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 may immediately make the message available for
-                another pull request. The minimum deadline you can specify is 0 seconds.
-                The maximum deadline you can specify is 600 seconds (10 minutes).
+                made. Specifying zero might immediately make the message available for
+                delivery to another subscriber client. This typically results in an
+                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).
             retry (Optional[google.api_core.retry.Retry]):  A retry object used
                 to retry requests. If ``None`` is specified, requests will not
                 be retried.
@@ -1015,8 +1019,13 @@ def list_snapshots(
         metadata=None,
     ):
         """
-        Lists the existing snapshots.<br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        Lists the existing snapshots. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
 
@@ -1108,8 +1117,11 @@ def create_snapshot(
         metadata=None,
     ):
         """
-        Creates a snapshot from the requested subscription. ALPHA: This feature
-        is part of an alpha release. This API might be changed in
+        Creates a snapshot from the requested subscription. Snapshots are used
+        in Seek 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 captured by a snapshot. BETA: This
+        feature is part of a beta 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. If the snapshot already
         exists, returns ``ALREADY_EXISTS``. If the requested subscription
@@ -1119,9 +1131,9 @@ def create_snapshot(
         ``Snapshot.expire_time`` field. If the name is not provided in the
         request, the server will assign a random name for this snapshot on the
         same project as the subscription, conforming to the `resource name
-        format <https://cloud.google.com/pubsub/docs/overview#names>`__. The
-        generated name is populated in the returned Snapshot object. Note that
-        for REST API requests, you must specify a name in the request.
+        format <https://cloud.google.com/pubsub/docs/admin#resource_names>`__.
+        The generated name is populated in the returned Snapshot object. Note
+        that for REST API requests, you must specify a name in the request.
 
         Example:
             >>> from google.cloud import pubsub_v1
@@ -1147,7 +1159,8 @@ def create_snapshot(
                 messages published to the subscription's topic following the successful
                 completion of the CreateSnapshot request. Format is
                 ``projects/{project}/subscriptions/{sub}``.
-            labels (dict[str -> str]): See <a href="/pubsub/docs/labels"> Creating and managing labels</a>.
+            labels (dict[str -> str]): See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
+                managing labels</a>.
             retry (Optional[google.api_core.retry.Retry]):  A retry object used
                 to retry requests. If ``None`` is specified, requests will not
                 be retried.
@@ -1194,8 +1207,13 @@ def update_snapshot(
         metadata=None,
     ):
         """
-        Updates an existing snapshot.<br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        Updates an existing snapshot. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
         Note that certain properties of a snapshot are not modifiable.
@@ -1269,8 +1287,13 @@ def delete_snapshot(
         metadata=None,
     ):
         """
-        Removes an existing snapshot. <br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        Removes an existing snapshot. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
         When the snapshot is deleted, all messages retained in the snapshot
@@ -1333,8 +1356,14 @@ def seek(
     ):
         """
         Seeks an existing subscription to a point in time or to a given snapshot,
-        whichever is provided in the request.<br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        whichever is provided in the request. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot. Note that both the subscription and the snapshot
+        must be on the same topic.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
 
diff --git a/pubsub/google/cloud/pubsub_v1/gapic/transports/subscriber_grpc_transport.py b/pubsub/google/cloud/pubsub_v1/gapic/transports/subscriber_grpc_transport.py
index 717c04a407e4..ac8f5f096b64 100644
--- a/pubsub/google/cloud/pubsub_v1/gapic/transports/subscriber_grpc_transport.py
+++ b/pubsub/google/cloud/pubsub_v1/gapic/transports/subscriber_grpc_transport.py
@@ -111,9 +111,9 @@ def create_subscription(self):
         If the name is not provided in the request, the server will assign a
         random name for this subscription on the same project as the topic,
         conforming to the `resource name
-        format <https://cloud.google.com/pubsub/docs/overview#names>`__. The
-        generated name is populated in the returned Subscription object. Note
-        that for REST API requests, you must specify a name in the request.
+        format <https://cloud.google.com/pubsub/docs/admin#resource_names>`__.
+        The generated name is populated in the returned Subscription object.
+        Note that for REST API requests, you must specify a name in the request.
 
         Returns:
             Callable: A callable which accepts the appropriate
@@ -273,8 +273,13 @@ def modify_push_config(self):
     def list_snapshots(self):
         """Return the gRPC stub for :meth:`SubscriberClient.list_snapshots`.
 
-        Lists the existing snapshots.<br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        Lists the existing snapshots. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
 
@@ -289,8 +294,11 @@ def list_snapshots(self):
     def create_snapshot(self):
         """Return the gRPC stub for :meth:`SubscriberClient.create_snapshot`.
 
-        Creates a snapshot from the requested subscription. ALPHA: This feature
-        is part of an alpha release. This API might be changed in
+        Creates a snapshot from the requested subscription. Snapshots are used
+        in Seek 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 captured by a snapshot. BETA: This
+        feature is part of a beta 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. If the snapshot already
         exists, returns ``ALREADY_EXISTS``. If the requested subscription
@@ -300,9 +308,9 @@ def create_snapshot(self):
         ``Snapshot.expire_time`` field. If the name is not provided in the
         request, the server will assign a random name for this snapshot on the
         same project as the subscription, conforming to the `resource name
-        format <https://cloud.google.com/pubsub/docs/overview#names>`__. The
-        generated name is populated in the returned Snapshot object. Note that
-        for REST API requests, you must specify a name in the request.
+        format <https://cloud.google.com/pubsub/docs/admin#resource_names>`__.
+        The generated name is populated in the returned Snapshot object. Note
+        that for REST API requests, you must specify a name in the request.
 
         Returns:
             Callable: A callable which accepts the appropriate
@@ -315,8 +323,13 @@ def create_snapshot(self):
     def update_snapshot(self):
         """Return the gRPC stub for :meth:`SubscriberClient.update_snapshot`.
 
-        Updates an existing snapshot.<br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        Updates an existing snapshot. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
         Note that certain properties of a snapshot are not modifiable.
@@ -332,8 +345,13 @@ def update_snapshot(self):
     def delete_snapshot(self):
         """Return the gRPC stub for :meth:`SubscriberClient.delete_snapshot`.
 
-        Removes an existing snapshot. <br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        Removes an existing snapshot. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
         When the snapshot is deleted, all messages retained in the snapshot
@@ -353,8 +371,14 @@ def seek(self):
         """Return the gRPC stub for :meth:`SubscriberClient.seek`.
 
         Seeks an existing subscription to a point in time or to a given snapshot,
-        whichever is provided in the request.<br><br>
-        <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        whichever is provided in the request. Snapshots are used in
+        <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+        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
+        captured by a snapshot. Note that both the subscription and the snapshot
+        must be on the same topic.<br><br>
+        <b>BETA:</b> This feature is part of a beta 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.
 
diff --git a/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2.py b/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2.py
index 50f0a4b791a9..495d1f56362e 100644
--- a/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2.py
+++ b/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2.py
@@ -27,7 +27,7 @@
     package="google.pubsub.v1",
     syntax="proto3",
     serialized_pb=_b(
-        '\n)google/cloud/pubsub_v1/proto/pubsub.proto\x12\x10google.pubsub.v1\x1a\x1cgoogle/api/annotations.proto\x1a\x1egoogle/protobuf/duration.proto\x1a\x1bgoogle/protobuf/empty.proto\x1a google/protobuf/field_mask.proto\x1a\x1fgoogle/protobuf/timestamp.proto";\n\x14MessageStoragePolicy\x12#\n\x1b\x61llowed_persistence_regions\x18\x01 \x03(\t"\xc1\x01\n\x05Topic\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x33\n\x06labels\x18\x02 \x03(\x0b\x32#.google.pubsub.v1.Topic.LabelsEntry\x12\x46\n\x16message_storage_policy\x18\x03 \x01(\x0b\x32&.google.pubsub.v1.MessageStoragePolicy\x1a-\n\x0bLabelsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01"\xdb\x01\n\rPubsubMessage\x12\x0c\n\x04\x64\x61ta\x18\x01 \x01(\x0c\x12\x43\n\nattributes\x18\x02 \x03(\x0b\x32/.google.pubsub.v1.PubsubMessage.AttributesEntry\x12\x12\n\nmessage_id\x18\x03 \x01(\t\x12\x30\n\x0cpublish_time\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x1a\x31\n\x0f\x41ttributesEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01" \n\x0fGetTopicRequest\x12\r\n\x05topic\x18\x01 \x01(\t"m\n\x12UpdateTopicRequest\x12&\n\x05topic\x18\x01 \x01(\x0b\x32\x17.google.pubsub.v1.Topic\x12/\n\x0bupdate_mask\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.FieldMask"R\n\x0ePublishRequest\x12\r\n\x05topic\x18\x01 \x01(\t\x12\x31\n\x08messages\x18\x02 \x03(\x0b\x32\x1f.google.pubsub.v1.PubsubMessage"&\n\x0fPublishResponse\x12\x13\n\x0bmessage_ids\x18\x01 \x03(\t"K\n\x11ListTopicsRequest\x12\x0f\n\x07project\x18\x01 \x01(\t\x12\x11\n\tpage_size\x18\x02 \x01(\x05\x12\x12\n\npage_token\x18\x03 \x01(\t"V\n\x12ListTopicsResponse\x12\'\n\x06topics\x18\x01 \x03(\x0b\x32\x17.google.pubsub.v1.Topic\x12\x17\n\x0fnext_page_token\x18\x02 \x01(\t"U\n\x1dListTopicSubscriptionsRequest\x12\r\n\x05topic\x18\x01 \x01(\t\x12\x11\n\tpage_size\x18\x02 \x01(\x05\x12\x12\n\npage_token\x18\x03 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.google.pubsub.v1.PublishRequest\x1a!.google.pubsub.v1.PublishResponse"2\x82\xd3\xe4\x93\x02,"\'/v1/{topic=projects/*/topics/*}:publish:\x01*\x12o\n\x08GetTopic\x12!.google.pubsub.v1.GetTopicRequest\x1a\x17.google.pubsub.v1.Topic"\'\x82\xd3\xe4\x93\x02!\x12\x1f/v1/{topic=projects/*/topics/*}\x12\x80\x01\n\nListTopics\x12#.google.pubsub.v1.ListTopicsRequest\x1a$.google.pubsub.v1.ListTopicsResponse"\'\x82\xd3\xe4\x93\x02!\x12\x1f/v1/{project=projects/*}/topics\x12\xb2\x01\n\x16ListTopicSubscriptions\x12/.google.pubsub.v1.ListTopicSubscriptionsRequest\x1a\x30.google.pubsub.v1.ListTopicSubscriptionsResponse"5\x82\xd3\xe4\x93\x02/\x12-/v1/{topic=projects/*/topics/*}/subscriptions\x12\xa2\x01\n\x12ListTopicSnapshots\x12+.google.pubsub.v1.ListTopicSnapshotsRequest\x1a,.google.pubsub.v1.ListTopicSnapshotsResponse"1\x82\xd3\xe4\x93\x02+\x12)/v1/{topic=projects/*/topics/*}/snapshots\x12t\n\x0b\x44\x65leteTopic\x12$.google.pubsub.v1.DeleteTopicRequest\x1a\x16.google.protobuf.Empty"\'\x82\xd3\xe4\x93\x02!*\x1f/v1/{topic=projects/*/topics/*}2\xf9\x11\n\nSubscriber\x12\x86\x01\n\x12\x43reateSubscription\x12\x1e.google.pubsub.v1.Subscription\x1a\x1e.google.pubsub.v1.Subscription"0\x82\xd3\xe4\x93\x02*\x1a%/v1/{name=projects/*/subscriptions/*}:\x01*\x12\x92\x01\n\x0fGetSubscription\x12(.google.pubsub.v1.GetSubscriptionRequest\x1a\x1e.google.pubsub.v1.Subscription"5\x82\xd3\xe4\x93\x02/\x12-/v1/{subscription=projects/*/subscriptions/*}\x12\xa0\x01\n\x12UpdateSubscription\x12+.google.pubsub.v1.UpdateSubscriptionRequest\x1a\x1e.google.pubsub.v1.Subscription"=\x82\xd3\xe4\x93\x02\x37\x32\x32/v1/{subscription.name=projects/*/subscriptions/*}:\x01*\x12\x9c\x01\n\x11ListSubscriptions\x12*.google.pubsub.v1.ListSubscriptionsRequest\x1a+.google.pubsub.v1.ListSubscriptionsResponse".\x82\xd3\xe4\x93\x02(\x12&/v1/{project=projects/*}/subscriptions\x12\x90\x01\n\x12\x44\x65leteSubscription\x12+.google.pubsub.v1.DeleteSubscriptionRequest\x1a\x16.google.protobuf.Empty"5\x82\xd3\xe4\x93\x02/*-/v1/{subscription=projects/*/subscriptions/*}\x12\xa3\x01\n\x11ModifyAckDeadline\x12*.google.pubsub.v1.ModifyAckDeadlineRequest\x1a\x16.google.protobuf.Empty"J\x82\xd3\xe4\x93\x02\x44"?/v1/{subscription=projects/*/subscriptions/*}:modifyAckDeadline:\x01*\x12\x91\x01\n\x0b\x41\x63knowledge\x12$.google.pubsub.v1.AcknowledgeRequest\x1a\x16.google.protobuf.Empty"D\x82\xd3\xe4\x93\x02>"9/v1/{subscription=projects/*/subscriptions/*}:acknowledge:\x01*\x12\x84\x01\n\x04Pull\x12\x1d.google.pubsub.v1.PullRequest\x1a\x1e.google.pubsub.v1.PullResponse"=\x82\xd3\xe4\x93\x02\x37"2/v1/{subscription=projects/*/subscriptions/*}:pull:\x01*\x12\x66\n\rStreamingPull\x12&.google.pubsub.v1.StreamingPullRequest\x1a\'.google.pubsub.v1.StreamingPullResponse"\x00(\x01\x30\x01\x12\xa0\x01\n\x10ModifyPushConfig\x12).google.pubsub.v1.ModifyPushConfigRequest\x1a\x16.google.protobuf.Empty"I\x82\xd3\xe4\x93\x02\x43">/v1/{subscription=projects/*/subscriptions/*}:modifyPushConfig:\x01*\x12~\n\x0bGetSnapshot\x12$.google.pubsub.v1.GetSnapshotRequest\x1a\x1a.google.pubsub.v1.Snapshot"-\x82\xd3\xe4\x93\x02\'\x12%/v1/{snapshot=projects/*/snapshots/*}\x12\x8c\x01\n\rListSnapshots\x12&.google.pubsub.v1.ListSnapshotsRequest\x1a\'.google.pubsub.v1.ListSnapshotsResponse"*\x82\xd3\xe4\x93\x02$\x12"/v1/{project=projects/*}/snapshots\x12\x83\x01\n\x0e\x43reateSnapshot\x12\'.google.pubsub.v1.CreateSnapshotRequest\x1a\x1a.google.pubsub.v1.Snapshot",\x82\xd3\xe4\x93\x02&\x1a!/v1/{name=projects/*/snapshots/*}:\x01*\x12\x8c\x01\n\x0eUpdateSnapshot\x12\'.google.pubsub.v1.UpdateSnapshotRequest\x1a\x1a.google.pubsub.v1.Snapshot"5\x82\xd3\xe4\x93\x02/2*/v1/{snapshot.name=projects/*/snapshots/*}:\x01*\x12\x80\x01\n\x0e\x44\x65leteSnapshot\x12\'.google.pubsub.v1.DeleteSnapshotRequest\x1a\x16.google.protobuf.Empty"-\x82\xd3\xe4\x93\x02\'*%/v1/{snapshot=projects/*/snapshots/*}\x12\x84\x01\n\x04Seek\x12\x1d.google.pubsub.v1.SeekRequest\x1a\x1e.google.pubsub.v1.SeekResponse"=\x82\xd3\xe4\x93\x02\x37"2/v1/{subscription=projects/*/subscriptions/*}:seek:\x01*B\xae\x01\n\x14\x63om.google.pubsub.v1B\x0bPubsubProtoP\x01Z6google.golang.org/genproto/googleapis/pubsub/v1;pubsub\xf8\x01\x01\xaa\x02\x16Google.Cloud.PubSub.V1\xca\x02\x16Google\\Cloud\\PubSub\\V1\xea\x02\x19Google::Cloud::PubSub::V1b\x06proto3'
     ),
     dependencies=[
         google_dot_api_dot_annotations__pb2.DESCRIPTOR,
@@ -2916,9 +2916,9 @@
 
     Attributes:
       allowed_persistence_regions:
-          The list of GCP regions where messages that are published to
-          the topic may be persisted in storage. Messages published by
-          publishers running in non-allowed GCP regions (or running
+          The list of GCP region IDs where messages that are published
+          to the topic may be persisted in storage. Messages published
+          by publishers running in non-allowed GCP regions (or running
           outside of GCP altogether) will be routed for storage in one
           of the allowed regions. An empty list indicates a
           misconfiguration at the project or organization level, which
@@ -2990,8 +2990,10 @@
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
         __doc__="""A message that is published by publishers and consumed by subscribers.
   The message must contain either a non-empty data field or at least one
-  attribute. See Quotas and limits for more information about message
-  limits.
+  attribute. Note that client libraries represent this object differently
+  depending on the language. See the corresponding client library
+  documentation for more information. See Quotas and limits for more
+  information about message limits.
   
   
   Attributes:
@@ -3204,8 +3206,8 @@
     dict(
         DESCRIPTOR=_LISTTOPICSNAPSHOTSREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the ``ListTopicSnapshots`` method. ALPHA: This feature is
-  part of an alpha release. This API might be changed in
+        __doc__="""Request for the ``ListTopicSnapshots`` method. BETA: This feature is
+  part of a beta 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.
   
@@ -3233,8 +3235,8 @@
     dict(
         DESCRIPTOR=_LISTTOPICSNAPSHOTSRESPONSE,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Response for the ``ListTopicSnapshots`` method. ALPHA: This feature is
-  part of an alpha release. This API might be changed in
+        __doc__="""Response for the ``ListTopicSnapshots`` method. BETA: This feature is
+  part of a beta 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.
   
@@ -3308,16 +3310,16 @@
           used to configure it. An empty ``pushConfig`` signifies that
           the subscriber will pull and ack messages using API methods.
       ack_deadline_seconds:
-          This value is the maximum time after a subscriber receives a
-          message before the subscriber should acknowledge the message.
-          After message delivery but before the ack deadline expires and
-          before the message is acknowledged, it is an outstanding
-          message and will not be delivered again during that time (on a
-          best-effort basis).  For pull subscriptions, this value is
-          used as the initial value for the ack deadline. To override
-          this value for a given message, call ``ModifyAckDeadline``
-          with the corresponding ``ack_id`` if using non-streaming pull
-          or send the ``ack_id`` in a
+          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 outstanding. 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 deadline. To override this value for a given message, call
+          ``ModifyAckDeadline`` with the corresponding ``ack_id`` if
+          using non-streaming pull or send the ``ack_id`` in a
           ``StreamingModifyAckDeadlineRequest`` if using streaming pull.
           The minimum custom deadline you can specify is 10 seconds. The
           maximum custom deadline you can specify is 600 seconds (10
@@ -3330,8 +3332,9 @@
           Indicates whether to retain acknowledged messages. If true,
           then messages are not expunged from the subscription's
           backlog, even if they are acknowledged, until they fall out of
-          the ``message_retention_duration`` window. ALPHA: This feature
-          is part of an alpha release. This API might be changed in
+          the ``message_retention_duration`` window. This must be true
+          if you would like to Seek to a timestamp. BETA: This feature
+          is part of a beta 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.
@@ -3342,7 +3345,7 @@
           also configures the retention of acknowledged messages, and
           thus configures how far back in time a ``Seek`` can be done.
           Defaults to 7 days. Cannot be more than 7 days or less than 10
-          minutes. ALPHA: This feature is part of an alpha release. This
+          minutes. BETA: This feature is part of a beta 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.
@@ -3662,11 +3665,12 @@
           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 may
-          immediately make the message available for another pull
-          request. The minimum deadline you can specify is 0 seconds.
-          The maximum deadline you can specify is 600 seconds (10
-          minutes).
+          ``ModifyAckDeadline`` call was made. Specifying zero might
+          immediately make the message available for delivery to another
+          subscriber client. This typically results in an 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).
   """,
         # @@protoc_insertion_point(class_scope:google.pubsub.v1.ModifyAckDeadlineRequest)
     ),
@@ -3789,10 +3793,10 @@
         ),
         DESCRIPTOR=_CREATESNAPSHOTREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the ``CreateSnapshot`` method. ALPHA: This feature is part
-  of an 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.
+        __doc__="""Request for the ``CreateSnapshot`` method. BETA: This feature is part of
+  a beta 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.
   
   
   Attributes:
@@ -3828,8 +3832,8 @@
     dict(
         DESCRIPTOR=_UPDATESNAPSHOTREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the UpdateSnapshot method. ALPHA: This feature is part of an
-  alpha release. This API might be changed in backward-incompatible ways
+        __doc__="""Request for the UpdateSnapshot method. BETA: This feature is part of a
+  beta 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.
   
@@ -3861,9 +3865,12 @@
         ),
         DESCRIPTOR=_SNAPSHOT,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""A snapshot resource. ALPHA: This feature is part of an 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
+        __doc__="""A snapshot resource. Snapshots are used in Seek 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 captured by a snapshot. BETA: This feature is part of a beta
+  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.
   
   
@@ -3901,10 +3908,10 @@
     dict(
         DESCRIPTOR=_GETSNAPSHOTREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the GetSnapshot method. ALPHA: This feature is part of an
-  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.
+        __doc__="""Request for the GetSnapshot method. BETA: This feature is part of a beta
+  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.
   
   
   Attributes:
@@ -3923,10 +3930,10 @@
     dict(
         DESCRIPTOR=_LISTSNAPSHOTSREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the ``ListSnapshots`` method. ALPHA: This feature is part of
-  an 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.
+        __doc__="""Request for the ``ListSnapshots`` method. BETA: This feature is part of
+  a beta 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.
   
   
   Attributes:
@@ -3952,10 +3959,10 @@
     dict(
         DESCRIPTOR=_LISTSNAPSHOTSRESPONSE,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Response for the ``ListSnapshots`` method. ALPHA: This feature is part
-  of an 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.
+        __doc__="""Response for the ``ListSnapshots`` method. BETA: This feature is part of
+  a beta 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.
   
   
   Attributes:
@@ -3977,10 +3984,10 @@
     dict(
         DESCRIPTOR=_DELETESNAPSHOTREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the ``DeleteSnapshot`` method. ALPHA: This feature is part
-  of an 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.
+        __doc__="""Request for the ``DeleteSnapshot`` method. BETA: This feature is part of
+  a beta 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.
   
   
   Attributes:
@@ -3999,7 +4006,7 @@
     dict(
         DESCRIPTOR=_SEEKREQUEST,
         __module__="google.cloud.pubsub_v1.proto.pubsub_pb2",
-        __doc__="""Request for the ``Seek`` method. ALPHA: This feature is part of an alpha
+        __doc__="""Request for the ``Seek`` method. BETA: This feature is part of a beta
   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.
@@ -4049,7 +4056,7 @@
 DESCRIPTOR._options = _descriptor._ParseOptions(
     descriptor_pb2.FileOptions(),
     _b(
-        "\n\024com.google.pubsub.v1B\013PubsubProtoP\001Z6google.golang.org/genproto/googleapis/pubsub/v1;pubsub\370\001\001\252\002\026Google.Cloud.PubSub.V1\312\002\026Google\\Cloud\\PubSub\\V1"
+        "\n\024com.google.pubsub.v1B\013PubsubProtoP\001Z6google.golang.org/genproto/googleapis/pubsub/v1;pubsub\370\001\001\252\002\026Google.Cloud.PubSub.V1\312\002\026Google\\Cloud\\PubSub\\V1\352\002\031Google::Cloud::PubSub::V1"
     ),
 )
 _TOPIC_LABELSENTRY.has_options = True
diff --git a/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2_grpc.py b/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2_grpc.py
index 2a13a9d7b12c..7668377d78de 100644
--- a/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2_grpc.py
+++ b/pubsub/google/cloud/pubsub_v1/proto/pubsub_pb2_grpc.py
@@ -67,7 +67,8 @@ class PublisherServicer(object):
 
     def CreateTopic(self, request, context):
         """Creates the given topic with the given name. See the
-    <a href="/pubsub/docs/admin#resource_names"> resource name rules</a>.
+    <a href="https://cloud.google.com/pubsub/docs/admin#resource_names">
+    resource name rules</a>.
     """
         context.set_code(grpc.StatusCode.UNIMPLEMENTED)
         context.set_details("Method not implemented!")
@@ -111,8 +112,13 @@ def ListTopicSubscriptions(self, request, context):
         raise NotImplementedError("Method not implemented!")
 
     def ListTopicSnapshots(self, request, context):
-        """Lists the names of the snapshots on this topic.<br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        """Lists the names of the snapshots on this topic. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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
+    captured by a snapshot.<br><br>
+    <b>BETA:</b> This feature is part of a beta 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.
     """
@@ -283,14 +289,15 @@ class SubscriberServicer(object):
 
     def CreateSubscription(self, request, context):
         """Creates a subscription to a given topic. See the
-    <a href="/pubsub/docs/admin#resource_names"> resource name rules</a>.
+    <a href="https://cloud.google.com/pubsub/docs/admin#resource_names">
+    resource name rules</a>.
     If the subscription already exists, returns `ALREADY_EXISTS`.
     If the corresponding topic doesn't exist, returns `NOT_FOUND`.
 
     If the name is not provided in the request, the server will assign a random
     name for this subscription on the same project as the topic, conforming
     to the
-    [resource name format](https://cloud.google.com/pubsub/docs/overview#names).
+    [resource name format](https://cloud.google.com/pubsub/docs/admin#resource_names).
     The generated name is populated in the returned Subscription object.
     Note that for REST API requests, you must specify a name in the request.
     """
@@ -390,8 +397,12 @@ def ModifyPushConfig(self, request, context):
         raise NotImplementedError("Method not implemented!")
 
     def GetSnapshot(self, request, context):
-        """Gets the configuration details of a snapshot.<br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        """Gets the configuration details of a snapshot. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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 captured by a snapshot.<br><br>
+    <b>BETA:</b> This feature is part of a beta 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.
     """
@@ -400,8 +411,13 @@ def GetSnapshot(self, request, context):
         raise NotImplementedError("Method not implemented!")
 
     def ListSnapshots(self, request, context):
-        """Lists the existing snapshots.<br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        """Lists the existing snapshots. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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
+    captured by a snapshot.<br><br>
+    <b>BETA:</b> This feature is part of a beta 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.
     """
@@ -410,8 +426,14 @@ def ListSnapshots(self, request, context):
         raise NotImplementedError("Method not implemented!")
 
     def CreateSnapshot(self, request, context):
-        """Creates a snapshot from the requested subscription.<br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        """Creates a snapshot from the requested subscription. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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
+    captured by a snapshot.
+    <br><br>
+    <b>BETA:</b> This feature is part of a beta 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.<br><br>
     If the snapshot already exists, returns `ALREADY_EXISTS`.
@@ -421,18 +443,23 @@ def CreateSnapshot(self, request, context):
     See also the `Snapshot.expire_time` field. If the name is not provided in
     the request, the server will assign a random
     name for this snapshot on the same project as the subscription, conforming
-    to the [resource name format](https://cloud.google.com/pubsub/docs/overview#names).
-    The generated
-    name is populated in the returned Snapshot object. Note that for REST API
-    requests, you must specify a name in the request.
+    to the
+    [resource name format](https://cloud.google.com/pubsub/docs/admin#resource_names).
+    The generated name is populated in the returned Snapshot object. Note that
+    for REST API requests, you must specify a name in the request.
     """
         context.set_code(grpc.StatusCode.UNIMPLEMENTED)
         context.set_details("Method not implemented!")
         raise NotImplementedError("Method not implemented!")
 
     def UpdateSnapshot(self, request, context):
-        """Updates an existing snapshot.<br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        """Updates an existing snapshot. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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
+    captured by a snapshot.<br><br>
+    <b>BETA:</b> This feature is part of a beta 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.
     Note that certain properties of a snapshot are not modifiable.
@@ -442,8 +469,13 @@ def UpdateSnapshot(self, request, context):
         raise NotImplementedError("Method not implemented!")
 
     def DeleteSnapshot(self, request, context):
-        """Removes an existing snapshot. <br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+        """Removes an existing snapshot. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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
+    captured by a snapshot.<br><br>
+    <b>BETA:</b> This feature is part of a beta 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.
     When the snapshot is deleted, all messages retained in the snapshot
@@ -457,8 +489,14 @@ def DeleteSnapshot(self, request, context):
 
     def Seek(self, request, context):
         """Seeks an existing subscription to a point in time or to a given snapshot,
-    whichever is provided in the request.<br><br>
-    <b>ALPHA:</b> This feature is part of an alpha release. This API might be
+    whichever is provided in the request. Snapshots are used in
+    <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
+    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
+    captured by a snapshot. Note that both the subscription and the snapshot
+    must be on the same topic.<br><br>
+    <b>BETA:</b> This feature is part of a beta 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.
     """
diff --git a/pubsub/synth.metadata b/pubsub/synth.metadata
index 600c1135d368..84db296a1c2a 100644
--- a/pubsub/synth.metadata
+++ b/pubsub/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2018-12-18T13:23:31.222196Z",
+  "updateTime": "2019-01-05T13:24:39.145322Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.3",
-        "dockerImage": "googleapis/artman@sha256:bfb92654b4a77368471f70e2808eaf4e60f263b9559f27bb3284097322787bf1"
+        "version": "0.16.4",
+        "dockerImage": "googleapis/artman@sha256:8b45fae963557c3299921037ecbb86f0689f41b1b4aea73408ebc50562cb2857"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "c04bc0dc0a9164d924a9ab923fd6845b4ae6a7ab",
-        "internalRef": "225851467"
+        "sha": "a111a53c0c6722afcd793b64724ceef7862db5b9",
+        "internalRef": "227896184"
       }
     },
     {