code: func (e *CombinedEtcdClient) SetEtcdVersionKeyValue(version *EtcdVersion) error {
  	return e.Put(version, "etcd_version", version.String())
  }
docs: // SetEtcdVersionKeyValue writes the given version to the etcd 'etcd_version' key.
  // If no error is returned, the write was successful, indicating the etcd server is available
  // and able to perform consensus writes.