code: func (prometheusMetricsProvider) NewDeprecatedDepthMetric(name string) workqueue.GaugeMetric {
  	depth := prometheus.NewGauge(prometheus.GaugeOpts{
  		Subsystem: name,
  		Name:      "depth",
  		Help:      "(Deprecated) Current depth of workqueue: " + name,
  	})
  	if err := prometheus.Register(depth); err != nil {
  		klog.Errorf("failed to register depth metric %v: %v", name, err)
  	}
  	return depth
  }
docs: // TODO(danielqsj): Remove the following metrics, they are deprecated