code: public com.google.protobuf.UInt32Value getConfigVersion() {
      return configVersion_ == null ? com.google.protobuf.UInt32Value.getDefaultInstance() : configVersion_;
    }
docs: <pre>
  The semantic version of the service configuration. The config version
  affects the interpretation of the service configuration. For example,
  certain features are enabled by default for certain config versions.
  The latest config version is `3`.
  </pre>
  
  <code>.google.protobuf.UInt32Value config_version = 20;</code>