metrics/grafana: revert pr/30311 and fix the 'PD Client CMD Duration' panel

[tiancaiamao]

What problem does this PR solve?

Issue Number: close #30307

Problem Summary:

What is changed and how it works?

Something is wrong, I think I made some mistakes
This time it should be correct.

Check List

Tests

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

tiup playground
explore & edit & export ...
import again & verify the changes ...

• 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

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

None

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[tiprow]

Hi @tiancaiamao. Thanks for your PR.

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[jackysp]

LGTM

[codecov]

Codecov Report

Merging #46754 (03f5f5d) into master (670778e) will increase coverage by 2.4282%.
Report is 292 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46754        +/-   ##
================================================
+ Coverage   73.2873%   75.7155%   +2.4282%     
================================================
  Files          1319       1382        +63     
  Lines        395898     435839     +39941     
================================================
+ Hits         290143     329998     +39855     
- Misses        87268      87555       +287     
+ Partials      18487      18286       -201     

Flag	Coverage Δ
integration	40.9922% <ø> (?)
unit	76.1841% <ø> (+2.8968%)	⬆️

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

Components	Coverage Δ
dumpling	54.4418% <ø> (+0.3973%)	⬆️
parser	88.0107% <ø> (+3.0193%)	⬆️
br	51.6584% <ø> (-0.8050%)	⬇️

[tiancaiamao]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackysp, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-07 10:07:13.402943385 +0000 UTC m=+2612797.951959371: ☑️ agreed by jackysp.
• 2023-09-20 03:11:02.201199541 +0000 UTC m=+659828.168787586: ☑️ agreed by tangenta.

[wuhuizuo]

/retest

[tiancaiamao]

/merge

[ti-chi-bot]

@tiancaiamao: We have migrated to builtin LGTM and approve plugins for reviewing.

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[tiancaiamao]

/check-issue-triage-complete

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #47504.