add monitor nm heart time log

nm/start.go

@@ -195,7 +195,9 @@ func monitorWorker(op *operate.DockerOp) {
 
 				log.Info("------------------------Start rev msg worker thread------------------------")
 				for {
-					if time.Now().Sub(nodeManager.GetLastHeartTime()) == time.Duration(conf.GetConfig().HeartRespTimeSecond) {
+					sub := time.Now().Sub(nodeManager.GetLastHeartTime())
+					log.WithField("time(uint seconds)", sub).Info("The time difference since the last heartbeat")
+					if sub == time.Duration(conf.GetConfig().HeartRespTimeSecond) {
 						if nodeManager.Status {
 							nodeManager.UpdateStatus(false)
 						}