code: func (cml *ConfigMapLock) Update(ler LeaderElectionRecord) error {
  	if cml.cm == nil {
  		return errors.New("configmap not initialized, call get or create first")
  	}
  	recordBytes, err := json.Marshal(ler)
  	if err != nil {
  		return err
  	}
  	cml.cm.Annotations[LeaderElectionRecordAnnotationKey] = string(recordBytes)
  	cml.cm, err = cml.Client.ConfigMaps(cml.ConfigMapMeta.Namespace).Update(cml.cm)
  	return err
  }
docs: // Update will update an existing annotation on a given resource.