scheduler: introduce base class of hot region scheduler

[lhy1024]

Signed-off-by: lhy1024 admin@liudos.us

What problem does this PR solve?

Issue Number: Ref #5691

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• HunDunDM
• nolouch

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[codecov]

Codecov Report

Base: 75.65% // Head: 75.69% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (d76d994) compared to base (7a040fd).
Patch coverage: 98.76% of modified lines in pull request are covered.

❗ Current head d76d994 differs from pull request most recent head af96d18. Consider uploading reports for the commit af96d18 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5708      +/-   ##
==========================================
+ Coverage   75.65%   75.69%   +0.04%     
==========================================
  Files         329      329              
  Lines       32689    32654      -35     
==========================================
- Hits        24730    24718      -12     
+ Misses       5817     5808       -9     
+ Partials     2142     2128      -14     

Flag	Coverage Δ
unittests	75.69% <98.76%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
server/schedulers/hot_region.go	84.93% <98.48%> (-0.11%)	⬇️
server/schedulers/grant_hot_region.go	53.97% <100.00%> (-4.70%)	⬇️
server/schedulers/shuffle_hot_region.go	55.12% <100.00%> (-10.88%)	⬇️
pkg/metricutil/metricutil.go	82.75% <0.00%> (-10.35%)	⬇️
server/id/id.go	83.05% <0.00%> (-10.17%)	⬇️
server/region_syncer/server.go	82.96% <0.00%> (-4.40%)	⬇️
server/member/member.go	62.10% <0.00%> (-3.69%)	⬇️
pkg/etcdutil/etcdutil.go	84.88% <0.00%> (-3.49%)	⬇️
server/election/leadership.go	75.25% <0.00%> (-2.07%)	⬇️
... and 27 more

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d76d994

[ti-chi-bot]

@lhy1024: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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 ti-community-infra/tichi repository.