code: func (elk *UDPHook) Levels() []log.Level {
  	return []log.Level{
  		log.PanicLevel,
  		log.FatalLevel,
  		log.ErrorLevel,
  		log.WarnLevel,
  		log.InfoLevel,
  		log.DebugLevel,
  	}
  }
docs: // Levels returns logging levels supported by logrus