pdms: fix pdms grafana display

[HuSharp]

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)

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after

Release notes:

NONE

[ti-chi-bot]

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[HuSharp]

@lhy1024 @rleungx PTAL, thx!

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.06%. Comparing base (9e11d0e) to head (cd07a2b).

❗ Current head cd07a2b differs from pull request most recent head e1db0bb. Consider uploading reports for the commit e1db0bb to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2382   +/-   ##
=======================================
  Coverage   56.06%   56.06%           
=======================================
  Files         329      329           
  Lines       35040    35040           
=======================================
  Hits        19644    19644           
  Misses      13058    13058           
  Partials     2338     2338           

Flag	Coverage Δ
playground	15.79% <100.00%> (+0.01%)	⬆️
tiup	33.64% <ø> (ø)
unittest	22.22% <0.00%> (-0.01%)	⬇️

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-26 01:57:37.41884204 +0000 UTC m=+1946684.441088428: ☑️ agreed by kaaaaaaang.