code: public com.google.appengine.v1.ContainerInfo getContainer() {
      return container_ == null ? com.google.appengine.v1.ContainerInfo.getDefaultInstance() : container_;
    }
docs: <pre>
  A Docker image that App Engine uses to run the version.
  Only applicable for instances in App Engine flexible environment.
  </pre>
  
  <code>.google.appengine.v1.ContainerInfo container = 2;</code>