Observability improvement：grafana show errors if stats meta missing
Open
severity/moderate
type/enhancement
- Dominant language
- Go
- Stars
- 40.5k
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
stats meta missing such as this issue https://github.com/pingcap/tidb/issues/36004
### 2. What did you expect to see? (Required)
grafana can show errors
### 3. What did you see instead (Required)
no any error show
### 4. What is your TiDB version? (Required)
do not matter
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Assessment
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