code: public com.google.protobuf.Duration getLatency() {
      return latency_ == null ? com.google.protobuf.Duration.getDefaultInstance() : latency_;
    }
docs: <pre>
  The request processing latency on the server, from the time the request was
  received until the response was sent.
  </pre>
  
  <code>.google.protobuf.Duration latency = 14;</code>