Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="remotebuildexecution_v1alpha.html">Remote Build Execution API</a> . <a href="remotebuildexecution_v1alpha.projects.html">projects</a> . <a href="remotebuildexecution_v1alpha.projects.instances.html">instances</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="remotebuildexecution_v1alpha.projects.instances.workerpools.html">workerpools()</a></code>
+</p>
+<p class="firstline">Returns the workerpools Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#create">create(parent, body, x__xgafv=None)</a></code></p>
+<p class="firstline">Creates a new instance in the specified region.</p>
+<p class="toc_element">
+  <code><a href="#delete">delete(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Deletes the specified instance.</p>
+<p class="toc_element">
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns the specified instance.</p>
+<p class="toc_element">
+  <code><a href="#list">list(parent, x__xgafv=None)</a></code></p>
+<p class="firstline">Lists instances in a project.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="create">create(parent, body, x__xgafv=None)</code>
+  <pre>Creates a new instance in the specified region.
+Returns a long running operation which contains an instance on completion.
+While the long running operation is in progress, any call to `GetInstance`
+returns an instance in state `CREATING`.
+
+Args:
+  parent: string, Resource name of the project containing the instance.
+Format: `projects/[PROJECT_ID]`. (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # The request used for `CreateInstance`.
+    "instanceId": "A String", # ID of the created instance.
+        # A valid `instance_id` must:
+        # be 6-50 characters long,
+        # contain only lowercase letters, digits, hyphens and underscores,
+        # start with a lowercase letter, and
+        # end with a lowercase letter or a digit.
+    "instance": { # Instance conceptually encapsulates all Remote Build Execution resources # Specifies the instance to create.
+        # The name in the instance, if specified in the instance, is ignored.
+        # for remote builds.
+        # An instance consists of storage and compute resources (for example,
+        # `ContentAddressableStorage`, `ActionCache`, `WorkerPools`) used for
+        # running remote builds.
+        # All Remote Build Execution API calls are scoped to an instance.
+      "loggingEnabled": True or False, # Output only. Whether stack driver logging is enabled for the instance.
+      "state": "A String", # Output only. State of the instance.
+      "location": "A String", # The location is a GCP region. Currently only `us-central1` is supported.
+      "name": "A String", # Output only. Instance resource name formatted as:
+          # `projects/[PROJECT_ID]/instances/[INSTANCE_ID]`.
+          # Name should not be populated when creating an instance since it is provided
+          # in the `instance_id` field.
+    },
+    "parent": "A String", # Resource name of the project containing the instance.
+        # Format: `projects/[PROJECT_ID]`.
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # This resource represents a long-running operation that is the result of a
+      # network API call.
+    "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). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
+        #
+        # 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.
+      "code": 42, # The status code, which should be an enum value of google.rpc.Code.
+      "details": [ # A list of messages that carry the error details.  There is a common set of
+          # message types for APIs to use.
+        {
+          "a_key": "", # Properties of the object. Contains field @type with type URL.
+        },
+      ],
+    },
+    "done": True or False, # If the value is `false`, it means the operation is still in progress.
+        # If `true`, the operation is completed, and either `error` or `response` is
+        # available.
+    "response": { # The normal response of the operation in case of success.  If the original
+        # method returns no data on success, such as `Delete`, the response is
+        # `google.protobuf.Empty`.  If the original method is standard
+        # `Get`/`Create`/`Update`, the response should be the resource.  For other
+        # methods, the response should have the type `XxxResponse`, where `Xxx`
+        # is the original method name.  For example, if the original method name
+        # is `TakeSnapshot()`, the inferred response type is
+        # `TakeSnapshotResponse`.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
+    "name": "A String", # The server-assigned name, which is only unique within the same service that
+        # originally returns it. If you use the default HTTP mapping, the
+        # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="delete">delete(name, x__xgafv=None)</code>
+  <pre>Deletes the specified instance.
+Returns a long running operation which contains a `google.protobuf.Empty`
+response on completion.
+Deleting an instance with worker pools in it will delete these worker
+pools.
+
+Args:
+  name: string, Name of the instance to delete.
+Format: `projects/[PROJECT_ID]/instances/[INSTANCE_ID]`. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # This resource represents a long-running operation that is the result of a
+      # network API call.
+    "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). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
+        #
+        # 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.
+      "code": 42, # The status code, which should be an enum value of google.rpc.Code.
+      "details": [ # A list of messages that carry the error details.  There is a common set of
+          # message types for APIs to use.
+        {
+          "a_key": "", # Properties of the object. Contains field @type with type URL.
+        },
+      ],
+    },
+    "done": True or False, # If the value is `false`, it means the operation is still in progress.
+        # If `true`, the operation is completed, and either `error` or `response` is
+        # available.
+    "response": { # The normal response of the operation in case of success.  If the original
+        # method returns no data on success, such as `Delete`, the response is
+        # `google.protobuf.Empty`.  If the original method is standard
+        # `Get`/`Create`/`Update`, the response should be the resource.  For other
+        # methods, the response should have the type `XxxResponse`, where `Xxx`
+        # is the original method name.  For example, if the original method name
+        # is `TakeSnapshot()`, the inferred response type is
+        # `TakeSnapshotResponse`.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
+    "name": "A String", # The server-assigned name, which is only unique within the same service that
+        # originally returns it. If you use the default HTTP mapping, the
+        # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
+  <pre>Returns the specified instance.
+
+Args:
+  name: string, Name of the instance to retrieve.
+Format: `projects/[PROJECT_ID]/instances/[INSTANCE_ID]`. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Instance conceptually encapsulates all Remote Build Execution resources
+      # for remote builds.
+      # An instance consists of storage and compute resources (for example,
+      # `ContentAddressableStorage`, `ActionCache`, `WorkerPools`) used for
+      # running remote builds.
+      # All Remote Build Execution API calls are scoped to an instance.
+    "loggingEnabled": True or False, # Output only. Whether stack driver logging is enabled for the instance.
+    "state": "A String", # Output only. State of the instance.
+    "location": "A String", # The location is a GCP region. Currently only `us-central1` is supported.
+    "name": "A String", # Output only. Instance resource name formatted as:
+        # `projects/[PROJECT_ID]/instances/[INSTANCE_ID]`.
+        # Name should not be populated when creating an instance since it is provided
+        # in the `instance_id` field.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list">list(parent, x__xgafv=None)</code>
+  <pre>Lists instances in a project.
+
+Args:
+  parent: string, Resource name of the project.
+Format: `projects/[PROJECT_ID]`. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    {
+    "instances": [ # The list of instances in a given project.
+      { # Instance conceptually encapsulates all Remote Build Execution resources
+          # for remote builds.
+          # An instance consists of storage and compute resources (for example,
+          # `ContentAddressableStorage`, `ActionCache`, `WorkerPools`) used for
+          # running remote builds.
+          # All Remote Build Execution API calls are scoped to an instance.
+        "loggingEnabled": True or False, # Output only. Whether stack driver logging is enabled for the instance.
+        "state": "A String", # Output only. State of the instance.
+        "location": "A String", # The location is a GCP region. Currently only `us-central1` is supported.
+        "name": "A String", # Output only. Instance resource name formatted as:
+            # `projects/[PROJECT_ID]/instances/[INSTANCE_ID]`.
+            # Name should not be populated when creating an instance since it is provided
+            # in the `instance_id` field.
+      },
+    ],
+  }</pre>
+</div>
+
+</body></html>
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