chore: regens API reference docs (#889)

diff --git a/docs/dyn/tpu_v1alpha1.projects.locations.nodes.html b/docs/dyn/tpu_v1alpha1.projects.locations.nodes.html
index e366c6a..25aef57 100644
--- a/docs/dyn/tpu_v1alpha1.projects.locations.nodes.html
+++ b/docs/dyn/tpu_v1alpha1.projects.locations.nodes.html
@@ -75,7 +75,7 @@
 <h1><a href="tpu_v1alpha1.html">Cloud TPU API</a> . <a href="tpu_v1alpha1.projects.html">projects</a> . <a href="tpu_v1alpha1.projects.locations.html">locations</a> . <a href="tpu_v1alpha1.projects.locations.nodes.html">nodes</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#create">create(parent, body, nodeId=None, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body=None, nodeId=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a node.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(name, x__xgafv=None)</a></code></p>
@@ -90,7 +90,7 @@
   <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="#reimage">reimage(name, body, x__xgafv=None)</a></code></p>
+  <code><a href="#reimage">reimage(name, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Reimages a node's OS.</p>
 <p class="toc_element">
   <code><a href="#start">start(name, body=None, x__xgafv=None)</a></code></p>
@@ -100,12 +100,12 @@
 <p class="firstline">Stops a node.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(parent, body, nodeId=None, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body=None, nodeId=None, x__xgafv=None)</code>
   <pre>Creates a node.
 
 Args:
   parent: string, The parent resource name. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A TPU instance.
@@ -121,28 +121,23 @@
       # conflicts with any subnetworks in the user's provided network, or the
       # provided network is peered with another network that is using that CIDR
       # block.
-      # Required.
   "description": "A String", # The user-supplied description of the TPU. Maximum of 512 characters.
-  "healthDescription": "A String", # Output only.
-      # If this field is populated, it contains a description of why the TPU Node
+  "healthDescription": "A String", # Output only. If this field is populated, it contains a description of why the TPU Node
       # is unhealthy.
   "labels": { # Resource labels to represent user-provided metadata.
     "a_key": "A String",
   },
-  "serviceAccount": "A String", # Output only.
-      # The service account used to run the tensor flow services within the node.
+  "serviceAccount": "A String", # Output only. The service account used to run the tensor flow services within the node.
       # To share resources, including Google Cloud Storage data, with the
       # Tensorflow job running in the Node, this account must have permissions to
       # that data.
-  "createTime": "A String", # Output only.
-      # The time when the node was created.
+  "createTime": "A String", # Output only. The time when the node was created.
   "tensorflowVersion": "A String", # The version of Tensorflow running in the Node.
       # Required.
   "network": "A String", # The name of a network they wish to peer the TPU node to. It must be a
       # preexisting Compute Engine network inside of the project on which this API
       # has been activated. If none is provided, "default" will be used.
-  "state": "A String", # Output only.
-      # The current state for the TPU Node.
+  "state": "A String", # Output only. The current state for the TPU Node.
   "health": "A String", # The health status of the TPU node.
   "networkEndpoints": [ # Output only. The network endpoints where TPU workers can be accessed and
       # sent work. It is recommended that Tensorflow clients of the node reach out
@@ -154,15 +149,12 @@
   ],
   "acceleratorType": "A String", # The type of hardware accelerators associated with this node.
       # Required.
-  "ipAddress": "A String", # Output only.
-      # DEPRECATED! Use network_endpoints instead.
+  "ipAddress": "A String", # Output only. DEPRECATED! Use network_endpoints instead.
       # The network address for the TPU Node as visible to Compute Engine
       # instances.
-  "port": "A String", # Output only.
-      # DEPRECATED! Use network_endpoints instead.
+  "port": "A String", # Output only. DEPRECATED! Use network_endpoints instead.
       # The network port for the TPU Node as visible to Compute Engine instances.
-  "name": "A String", # Output only.
-      # The immutable name of the TPU
+  "name": "A String", # Output only. The immutable name of the TPU
 }
 
   nodeId: string, The unqualified resource name.
@@ -176,58 +168,19 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -255,12 +208,6 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
   }</pre>
 </div>
 
@@ -280,58 +227,19 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -359,12 +267,6 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
   }</pre>
 </div>
 
@@ -395,28 +297,23 @@
         # conflicts with any subnetworks in the user's provided network, or the
         # provided network is peered with another network that is using that CIDR
         # block.
-        # Required.
     "description": "A String", # The user-supplied description of the TPU. Maximum of 512 characters.
-    "healthDescription": "A String", # Output only.
-        # If this field is populated, it contains a description of why the TPU Node
+    "healthDescription": "A String", # Output only. If this field is populated, it contains a description of why the TPU Node
         # is unhealthy.
     "labels": { # Resource labels to represent user-provided metadata.
       "a_key": "A String",
     },
-    "serviceAccount": "A String", # Output only.
-        # The service account used to run the tensor flow services within the node.
+    "serviceAccount": "A String", # Output only. The service account used to run the tensor flow services within the node.
         # To share resources, including Google Cloud Storage data, with the
         # Tensorflow job running in the Node, this account must have permissions to
         # that data.
-    "createTime": "A String", # Output only.
-        # The time when the node was created.
+    "createTime": "A String", # Output only. The time when the node was created.
     "tensorflowVersion": "A String", # The version of Tensorflow running in the Node.
         # Required.
     "network": "A String", # The name of a network they wish to peer the TPU node to. It must be a
         # preexisting Compute Engine network inside of the project on which this API
         # has been activated. If none is provided, "default" will be used.
-    "state": "A String", # Output only.
-        # The current state for the TPU Node.
+    "state": "A String", # Output only. The current state for the TPU Node.
     "health": "A String", # The health status of the TPU node.
     "networkEndpoints": [ # Output only. The network endpoints where TPU workers can be accessed and
         # sent work. It is recommended that Tensorflow clients of the node reach out
@@ -428,15 +325,12 @@
     ],
     "acceleratorType": "A String", # The type of hardware accelerators associated with this node.
         # Required.
-    "ipAddress": "A String", # Output only.
-        # DEPRECATED! Use network_endpoints instead.
+    "ipAddress": "A String", # Output only. DEPRECATED! Use network_endpoints instead.
         # The network address for the TPU Node as visible to Compute Engine
         # instances.
-    "port": "A String", # Output only.
-        # DEPRECATED! Use network_endpoints instead.
+    "port": "A String", # Output only. DEPRECATED! Use network_endpoints instead.
         # The network port for the TPU Node as visible to Compute Engine instances.
-    "name": "A String", # Output only.
-        # The immutable name of the TPU
+    "name": "A String", # Output only. The immutable name of the TPU
   }</pre>
 </div>
 
@@ -475,28 +369,23 @@
             # conflicts with any subnetworks in the user's provided network, or the
             # provided network is peered with another network that is using that CIDR
             # block.
-            # Required.
         "description": "A String", # The user-supplied description of the TPU. Maximum of 512 characters.
-        "healthDescription": "A String", # Output only.
-            # If this field is populated, it contains a description of why the TPU Node
+        "healthDescription": "A String", # Output only. If this field is populated, it contains a description of why the TPU Node
             # is unhealthy.
         "labels": { # Resource labels to represent user-provided metadata.
           "a_key": "A String",
         },
-        "serviceAccount": "A String", # Output only.
-            # The service account used to run the tensor flow services within the node.
+        "serviceAccount": "A String", # Output only. The service account used to run the tensor flow services within the node.
             # To share resources, including Google Cloud Storage data, with the
             # Tensorflow job running in the Node, this account must have permissions to
             # that data.
-        "createTime": "A String", # Output only.
-            # The time when the node was created.
+        "createTime": "A String", # Output only. The time when the node was created.
         "tensorflowVersion": "A String", # The version of Tensorflow running in the Node.
             # Required.
         "network": "A String", # The name of a network they wish to peer the TPU node to. It must be a
             # preexisting Compute Engine network inside of the project on which this API
             # has been activated. If none is provided, "default" will be used.
-        "state": "A String", # Output only.
-            # The current state for the TPU Node.
+        "state": "A String", # Output only. The current state for the TPU Node.
         "health": "A String", # The health status of the TPU node.
         "networkEndpoints": [ # Output only. The network endpoints where TPU workers can be accessed and
             # sent work. It is recommended that Tensorflow clients of the node reach out
@@ -508,15 +397,12 @@
         ],
         "acceleratorType": "A String", # The type of hardware accelerators associated with this node.
             # Required.
-        "ipAddress": "A String", # Output only.
-            # DEPRECATED! Use network_endpoints instead.
+        "ipAddress": "A String", # Output only. DEPRECATED! Use network_endpoints instead.
             # The network address for the TPU Node as visible to Compute Engine
             # instances.
-        "port": "A String", # Output only.
-            # DEPRECATED! Use network_endpoints instead.
+        "port": "A String", # Output only. DEPRECATED! Use network_endpoints instead.
             # The network port for the TPU Node as visible to Compute Engine instances.
-        "name": "A String", # Output only.
-            # The immutable name of the TPU
+        "name": "A String", # Output only. The immutable name of the TPU
       },
     ],
   }</pre>
@@ -537,12 +423,12 @@
 </div>
 
 <div class="method">
-    <code class="details" id="reimage">reimage(name, body, x__xgafv=None)</code>
+    <code class="details" id="reimage">reimage(name, body=None, x__xgafv=None)</code>
   <pre>Reimages a node's OS.
 
 Args:
   name: string, The resource name. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for ReimageNode.
@@ -559,58 +445,19 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -638,12 +485,6 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
   }</pre>
 </div>
 
@@ -669,58 +510,19 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -748,12 +550,6 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
   }</pre>
 </div>
 
@@ -779,58 +575,19 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -858,12 +615,6 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
   }</pre>
 </div>