code: func (proxier *Proxier) SyncLoop() {
  	// Update healthz timestamp at beginning in case Sync() never succeeds.
  	if proxier.healthzServer != nil {
  		proxier.healthzServer.UpdateTimestamp()
  	}
  	proxier.syncRunner.Loop(wait.NeverStop)
  }
docs: // SyncLoop runs periodic work.  This is expected to run as a goroutine or as the main loop of the app.  It does not return.