code: func Register(asw cache.ActualStateOfWorld, dsw cache.DesiredStateOfWorld, pluginMgr *volume.VolumePluginMgr) {
  	registerMetrics.Do(func() {
  		prometheus.MustRegister(&totalVolumesCollector{asw, dsw, pluginMgr})
  	})
  }
docs: // Register registers Volume Manager metrics.