metrics: fix dr-auto-sync metics (#7975)

[ti-chi-bot]

This is an automated cherry-pick of #7975

What problem does this PR solve?

Issue Number: Close #7974

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• lhy1024

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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[codecov]

Codecov Report

Merging #7982 (1c00ff7) into release-8.0 (92a303c) will decrease coverage by 0.08%.
Report is 1 commits behind head on release-8.0.
The diff coverage is 100.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-8.0    #7982      +/-   ##
===============================================
- Coverage        73.50%   73.43%   -0.08%     
===============================================
  Files              436      436              
  Lines            48351    48354       +3     
===============================================
- Hits             35539    35507      -32     
- Misses            9751     9783      +32     
- Partials          3061     3064       +3     

Flag	Coverage Δ
unittests	73.43% <100.00%> (-0.08%)	⬇️

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[baurine]

/cherry-pick-invite

[ti-chi-bot]

@baurine you're not a member of org tikv