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]

A small amount of code for #3658 , #3833 , #3921 will be introduced.

[codecov]

Codecov Report

Merging #3966 (f2ea3be) into release-4.0 (99e700e) will increase coverage by 0.13%.
The diff coverage is 89.01%.

@@               Coverage Diff               @@
##           release-4.0    #3966      +/-   ##
===============================================
+ Coverage        74.85%   74.98%   +0.13%     
===============================================
  Files              211      211              
  Lines            20046    20061      +15     
===============================================
+ Hits             15005    15043      +38     
+ Misses            3711     3690      -21     
+ Partials          1330     1328       -2     

Flag	Coverage Δ
unittests	74.98% <89.01%> (+0.13%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/operator/operator.go	95.90% <71.42%> (-0.63%)	⬇️
server/schedulers/hot_region.go	82.45% <89.33%> (+1.52%)	⬆️
server/schedulers/hot_region_config.go	82.47% <100.00%> (+0.55%)	⬆️
server/schedulers/utils.go	91.66% <100.00%> (-0.31%)	⬇️
server/region_syncer/client.go	77.94% <0.00%> (-4.42%)	⬇️
server/schedulers/random_merge.go	61.29% <0.00%> (-3.23%)	⬇️
server/tso/tso.go	78.98% <0.00%> (-2.90%)	⬇️
server/grpc_service.go	59.47% <0.00%> (-0.81%)	⬇️
client/client.go	69.54% <0.00%> (-0.51%)	⬇️
server/server.go	73.94% <0.00%> (ø)
... and 8 more

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[HunDunDM]

/merge

[ti-chi-bot]

@HunDunDM: 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: f2ea3be