code: func (h *Handler) Handle(record *logging.Record) error {
  	switch record.Level {
  	case logging.EMERGENCY:
  		h.Counter.emergencyCounter.Inc()
  	case logging.ALERT:
  		h.Counter.alertCounter.Inc()
  	case logging.CRITICAL:
  		h.Counter.criticalCounter.Inc()
  	case logging.ERROR:
  		h.Counter.errorCounter.Inc()
  	case logging.WARNING:
  		h.Counter.warningCounter.Inc()
  	case logging.NOTICE:
  		h.Counter.noticeCounter.Inc()
  	case logging.INFO:
  		h.Counter.infoCounter.Inc()
  	case logging.DEBUG:
  		h.Counter.debugCounter.Inc()
  	}
  	return nil
  }
docs: // Handle increments Prometheus counter metrics based on
  // record log level.