# Common Monitoring Metrics for Service Port Status

__*TiDB Service Port Status Monitoring*__

![left](./student-guide/diagram/ServicePortStatus_en_001_20220621.png)
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For the monitoring method of Prometheus+Grafana, there is only one indicator in the monitoring information of Service Port Status, which is Service Up. This indicator is used to display the number of nodes that are online. If the color is red, it means that the node is not online. You can refer to the legend.

Please note that any monitoring metric must be aware of the timeframe before monitoring, which is the range you are concerned about.