[just for test]*: add log and metrics

[okJiang]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

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

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign siddontang for approval. For more information see the Code Review Process.

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[codecov]

Codecov Report

Attention: Patch coverage is 88.18182% with 13 lines in your changes missing coverage. Please review.

Project coverage is 76.35%. Comparing base (110f73c) to head (b71f6c8).

Additional details and impacted files

@@                  Coverage Diff                   @@
##           release-9.0-beta.1    #9153      +/-   ##
======================================================
+ Coverage               76.30%   76.35%   +0.05%     
======================================================
  Files                     473      473              
  Lines                   72011    72029      +18     
======================================================
+ Hits                    54948    55000      +52     
+ Misses                  13619    13585      -34     
  Partials                 3444     3444              

Flag	Coverage Δ
unittests	76.35% <88.18%> (∅)

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[okJiang]

/retest