metrics: fix duplicate ID

[CabinfeverB]

What problem does this PR solve?

Issue Number: ref #4399

What is changed and how does it work?

Check List

Tests

• Manual test (add detailed scripts or steps below)
  

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[codecov]

Codecov Report

Merging #7636 (fb7014e) into master (b7b4537) will decrease coverage by 0.06%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7636      +/-   ##
==========================================
- Coverage   74.73%   74.67%   -0.06%     
==========================================
  Files         459      459              
  Lines       50975    50975              
==========================================
- Hits        38094    38068      -26     
- Misses       9511     9519       +8     
- Partials     3370     3388      +18     

Flag	Coverage Δ
unittests	74.67% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

[CabinfeverB]

check #7588 again, no other errors.
And check all panels in manual test.

[CabinfeverB]

/merge

[ti-chi-bot]

@CabinfeverB: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: fb7014e