pkg/metrics: make the golang gc mpanel more readable

[XuHuaiyu]

What problem does this PR solve?

Issue Number: ref #55390

Problem Summary:

What changed and how does it work?

Before:

After:

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, wshwsh12

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-12 07:57:00.350465457 +0000 UTC m=+515890.090889396: ☑️ agreed by hawkingrei.
• 2024-09-12 07:57:12.736263558 +0000 UTC m=+515902.476687497: ☑️ agreed by wshwsh12.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.0686%. Comparing base (2842fcb) to head (5902a2f).
Report is 3 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56039         +/-   ##
=================================================
- Coverage   72.8872%   56.0686%   -16.8186%     
=================================================
  Files          1604       1729        +125     
  Lines        446775     622230     +175455     
=================================================
+ Hits         325642     348876      +23234     
- Misses       101085     249693     +148608     
- Partials      20048      23661       +3613     

Flag	Coverage Δ
integration	37.2428% <ø> (?)
unit	72.0035% <ø> (ø)

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.7798% <ø> (+7.0625%)	⬆️