multi: add debug logs to catch slow shutdown

channelnotifier/channelnotifier.go

@@ -104,7 +104,9 @@ func (c *ChannelNotifier) Start() error {
 func (c *ChannelNotifier) Stop() error {
 	var err error
 	c.stopped.Do(func() {
-		log.Info("ChannelNotifier shutting down")
+		log.Info("ChannelNotifier shutting down...")
+		defer log.Debug("ChannelNotifier shutdown complete")
+
 		err = c.ntfnServer.Stop()
 	})
 	return err