core: check stats healthy by reference

[nolouch]

What problem does this PR solve?

Issue Number: Close #8131 Ref #7897

What is changed and how does it work?

Check List

Tests

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

bench config:

round = 100000

store-count = 400
region-count = 10000000
leader-update-ratio = 0.0
epoch-update-ratio = 0.0
space-update-ratio = 0.0
flow-update-ratio = 0.0
no-update-ratio = 0.0

Before

After

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Attention: Patch coverage is 87.03704% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 77.36%. Comparing base (1679dbc) to head (c6d2fb9).

❗ Current head c6d2fb9 differs from pull request most recent head 3287f5c. Consider uploading reports for the commit 3287f5c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8132   +/-   ##
=======================================
  Coverage   77.35%   77.36%           
=======================================
  Files         471      471           
  Lines       61318    61338   +20     
=======================================
+ Hits        47435    47454   +19     
- Misses      10310    10311    +1     
  Partials     3573     3573           

Flag	Coverage Δ
unittests	77.36% <87.03%> (+<0.01%)	⬆️

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[nolouch]

PTAL @rleungx

[nolouch]

/merge

[ti-chi-bot]

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

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[ti-chi-bot]

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

Commit hash: c6d2fb9

[ti-chi-bot]

@nolouch: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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