if err != nil {
		return
	}
	addGauge := func(desc *metrics.Desc, pvcRef *stats.PVCReference, v float64, lv ...string) {
		lv = append([]string{pvcRef.Namespace, pvcRef.Name}, lv...)
		ch <- metrics.NewLazyConstMetric(desc, metrics.GaugeValue, v, lv...)
	}
	allPVCs := sets.Set[string]{}
	for _, podStat := range podStats {
		if podStat.VolumeStats == nil {
			continue
		}