code: func (s *fsResourceAnalyzer) Start() {
  	s.startOnce.Do(func() {
  		if s.calcPeriod <= 0 {
  			klog.Info("Volume stats collection disabled.")
  			return
  		}
  		klog.Info("Starting FS ResourceAnalyzer")
  		go wait.Forever(func() { s.updateCachedPodVolumeStats() }, s.calcPeriod)
  	})
  }
docs: // Start eager background caching of volume stats.