Patrol concurrency

[lhy1024]

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[bot]]

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[ti-chi-bot[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

[lhy1024]

overall lgtm, is this PR ready?

I am preparing some tests for different scenarios

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.26316% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 77.36%. Comparing base (4cd42b3) to head (ab9ef1e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8094      +/-   ##
==========================================
+ Coverage   77.29%   77.36%   +0.07%     
==========================================
  Files         471      471              
  Lines       61445    61515      +70     
==========================================
+ Hits        47491    47590      +99     
+ Misses      10395    10362      -33     
- Partials     3559     3563       +4     

Flag	Coverage Δ
unittests	77.36% <85.26%> (+0.07%)	:arrow_up:

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.26316% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 77.46%. Comparing base (4cd42b3) to head (c59b47c). Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8094      +/-   ##
==========================================
+ Coverage   77.29%   77.46%   +0.17%     
==========================================
  Files         471      471              
  Lines       61445    61548     +103     
==========================================
+ Hits        47491    47678     +187     
+ Misses      10395    10306      -89     
- Partials     3559     3564       +5     

Flag	Coverage Δ
unittests	77.46% <85.26%> (+0.17%)	:arrow_up:

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