metrics: Add slow score related metrics to grafana dashboard

[MyonKeminta]

What problem does this PR solve?

Issue Number: ref #51412

Problem Summary:

What changed and how does it work?

Added panels to the grafana dashboard to show states of slow scores.

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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[codecov]

Codecov Report

Merging #51773 (d7df81c) into master (d6de964) will increase coverage by 2.1082%.
Report is 9 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51773        +/-   ##
================================================
+ Coverage   70.7253%   72.8336%   +2.1082%     
================================================
  Files          1476       1476                
  Lines        437498     438697      +1199     
================================================
+ Hits         309422     319519     +10097     
+ Misses       108689      99130      -9559     
- Partials      19387      20048       +661     

Flag	Coverage Δ
integration	48.8857% <ø> (?)
unit	70.4933% <ø> (-0.0477%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.4468% <ø> (+5.5292%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfzjywxk, zyguan

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[cfzjywxk]

/merge

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[LGTM Timeline notifier]

Timeline:

• 2024-03-14 07:41:36.240459509 +0000 UTC m=+930523.262705897: ☑️ agreed by zyguan.
• 2024-03-14 12:13:17.702107289 +0000 UTC m=+946824.724353675: ☑️ agreed by cfzjywxk.