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PR Title Format:
1. pkg [, pkg2, pkg3]: what's changed
2. *: what's changed

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### What problem does this PR solve?

Issue Number: close #xxx <!-- REMOVE this line if no issue to close -->

Problem Summary:

### What is changed and how it works?

Proposal: [xxx](url) <!-- REMOVE this line if not applicable -->

What's Changed:

How it Works:

### Related changes

- PR to update `pingcap/docs`/`pingcap/docs-cn`:
- PR to update `pingcap/tidb-ansible`:
- Need to cherry-pick to the release branch

### Check List <!--REMOVE the items that are not applicable-->

Tests <!-- At least one of them must be included. -->

- Unit test
- Integration test
- Manual test (add detailed scripts or steps below)
- No code

Side effects

- Performance regression
    - Consumes more CPU
    - Consumes more MEM
- Breaking backward compatibility

### Release note <!-- bugfixes or new feature need a release note -->
