get:
  summary: google-cloud-api.Unimplemented
  description: |
    This is identical to `google.rpc.Unimplemented`,
    except with the `google-cloud-api` extension.
  operationId: google-cloud-api.unimplemented
  responses:
    501:
      $ref: ../../components/responses/google-cloud-api.error-unimplemented.yaml