Error “parse” in grafana curve_ exception: Encountered…”

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Problem phenomenon

The error reported by the configured grafana diagram is as follows:

 

 

Cause analysis

Click error reporting to see the details of error reporting. It is because the syntax of the query statement is abnormal.

 

 

The value of the variable pool is none

 

 

 

Solution

The query SQL of the variable pool needs to be modified. The modification effect is as follows:

 

 

After modification, the grafana diagram can display data normally: