Some DDL related metrics are not correctly processed
Open
affects-6.5
affects-7.1
affects-7.5
affects-8.1
affects-8.5
component/ddl
component/metrics
severity/major
type/bug
- Dominant language
- Go
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- 40.5k
- Forks
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
Each time TiDB execute an index DDL, a time series on metrics `tidb_ddl_backfill_percentage_progress` and `tidb_ddl_add_index_total` will be permanently added, causing problems when querying the corresponding Grafana after TiDB has been running for a long time.
### 2. What did you expect to see? (Required)
The metrics are removed after add index finished.
### 3. What did you see instead (Required)
Metrics remained after ddl finished.
### 4. What is your TiDB version? (Required)
From v7.1.x to master
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Assessment
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