code: func GlogSetter(val string) (string, error) {
  	var level klog.Level
  	if err := level.Set(val); err != nil {
  		return "", fmt.Errorf("failed set klog.logging.verbosity %s: %v", val, err)
  	}
  	return fmt.Sprintf("successfully set klog.logging.verbosity to %s", val), nil
  }
docs: // GlogSetter is a setter to set glog level.