code: public com.google.protobuf.Duration getIdleTimeout() {
      return idleTimeout_ == null ? com.google.protobuf.Duration.getDefaultInstance() : idleTimeout_;
    }
docs: <pre>
  Duration of time after the last request that an instance must wait before
  the instance is shut down.
  </pre>
  
  <code>.google.protobuf.Duration idle_timeout = 1;</code>