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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Release notes:

NONE

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[HuSharp]

@lhy1024 @rleungx PTAL, thx!

[ti-chi-bot[bot]]

@lhy1024: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to [this](https://github.com/pingcap/tiup/pull/2382#pullrequestreview-1930639780): > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/pingcap/tiup/pull/2382/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [playground](https://app.codecov.io/gh/pingcap/tiup/pull/2382/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `15.79% <100.00%> (+0.01%)` | :arrow_up: | | [tiup](https://app.codecov.io/gh/pingcap/tiup/pull/2382/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `33.64% <ø> (ø)` | | | [unittest](https://app.codecov.io/gh/pingcap/tiup/pull/2382/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `22.22% <0.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

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