introduce callerID for grpc and apply it for GetRegions
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type/enhancement
- Dominant language
- Go
- Stars
- 1.2k
- Forks
- 783
- Avg merge
- 5d 21h
- Merged PRs (30d)
- 36
Description
## Enhancement Task
`GetRegion(s)` is a hot path and an accident-prone area in PD. In order to better troubleshoot `GetRegion(s)` in the event of an incident, we decided to record callerID information for it to make it easier to know who was frantically calling `GetRegion(s)` in the meantime.
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