scheduler: fix inaccurate statistics and config (#3949)

[ti-chi-bot]

This is an automated cherry-pick of #3949

Signed-off-by: HunDunDM hundundm@gmail.com

What problem does this PR solve?

What is changed and how it works?

• scheduler: fix inaccurate statistics and config

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[HunDunDM]

pre PR is #4051

[HunDunDM]

A small amount of code for #3833 will be introduced.

[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: 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: 421d622

[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

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.

[codecov]

Codecov Report

Merging #3965 (421d622) into release-5.1 (2b8584e) will increase coverage by 0.03%.
The diff coverage is 95.91%.

@@               Coverage Diff               @@
##           release-5.1    #3965      +/-   ##
===============================================
+ Coverage        75.14%   75.18%   +0.03%     
===============================================
  Files              245      245              
  Lines            24657    24673      +16     
===============================================
+ Hits             18529    18550      +21     
+ Misses            4504     4502       -2     
+ Partials          1624     1621       -3     

Flag	Coverage Δ
unittests	75.18% <95.91%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
server/schedulers/hot_region.go	86.37% <95.00%> (+0.24%)	⬆️
server/schedulers/hot_region_config.go	82.47% <100.00%> (+0.55%)	⬆️
server/schedulers/utils.go	94.17% <100.00%> (+0.02%)	⬆️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/schedulers/random_merge.go	60.65% <0.00%> (-3.28%)	⬇️
server/tso/allocator_manager.go	76.79% <0.00%> (-2.18%)	⬇️
server/cluster/coordinator.go	73.31% <0.00%> (-0.73%)	⬇️
client/client.go	71.96% <0.00%> (+0.13%)	⬆️
pkg/btree/btree.go	86.26% <0.00%> (+0.48%)	⬆️
server/schedule/operator/step.go	69.10% <0.00%> (+0.66%)	⬆️
... and 6 more

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