code: public com.google.appengine.v1.ServingStatus getServingStatus() {
      com.google.appengine.v1.ServingStatus result = com.google.appengine.v1.ServingStatus.valueOf(servingStatus_);
      return result == null ? com.google.appengine.v1.ServingStatus.UNRECOGNIZED : result;
    }
docs: <pre>
  Current serving status of this version. Only the versions with a
  `SERVING` status create instances and can be billed.
  `SERVING_STATUS_UNSPECIFIED` is an invalid value. Defaults to `SERVING`.
  </pre>
  
  <code>.google.appengine.v1.ServingStatus serving_status = 15;</code>