metrics: fix bad estimate-inuse (#42062)

[ti-chi-bot]

This is an automated cherry-pick of #42062

What problem does this PR solve?

Issue Number: ref #42057

Problem Summary:

What is changed and how it works?

Check List

Tests

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

before

after

• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

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None

[ti-chi-bot]

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[hawkingrei]

/rebuild

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@4084b07). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #42071   +/-   ##
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  Misses                 ?      69816           
  Partials               ?      15417           

[YangKeao]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-15 10:08:54.774592412 +0000 UTC m=+625699.323608384: ☑️ agreed by tangenta.
• 2023-08-15 10:13:21.959762611 +0000 UTC m=+625966.508778596: ☑️ agreed by YangKeao.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, XuHuaiyu, YangKeao

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Needs approval from an approver in each of these files:

• OWNERS [XuHuaiyu,YangKeao,tangenta]

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