scheduler: consider evict leader when calc expect

[lhy1024]

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

What problem does this PR solve?

fix #3959

What is changed and how it works?

1. consider evict leader when calc expect
2. reduce the pending amp factor
3. unify qps and query as query, to ensure consistency with the documentation pd-control: add new config of balance-hot-region-scheduler pingcap/docs-cn#6835

Check List

Tests

• Unit test

Related changes

• PR to update pingcap/docs/pingcap/docs-cn: pd-control: add new config of balance-hot-region-scheduler pingcap/docs-cn#6835
• Need to cherry-pick to the release branch
• • 4.0 5.0 5.1 5.2

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• Yisaer

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[Yisaer]

Rest LGTM

[codecov]

Codecov Report

Merging #3967 (fb3c550) into master (bf39734) will decrease coverage by 0.01%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master    #3967      +/-   ##
==========================================
- Coverage   74.56%   74.55%   -0.02%     
==========================================
  Files         250      250              
  Lines       25486    25505      +19     
==========================================
+ Hits        19003    19014      +11     
- Misses       4793     4794       +1     
- Partials     1690     1697       +7     

Flag	Coverage Δ
unittests	74.55% <81.81%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
server/schedulers/hot_region.go	83.87% <ø> (-0.28%)	⬇️
server/schedulers/hot_region_config.go	89.31% <ø> (ø)
pkg/mock/mockcluster/mockcluster.go	95.25% <60.00%> (-0.45%)	⬇️
server/schedulers/utils.go	94.37% <88.23%> (-0.69%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/tso/tso.go	59.11% <0.00%> (-1.66%)	⬇️
server/member/member.go	63.10% <0.00%> (-1.61%)	⬇️
server/schedule/operator/step.go	68.43% <0.00%> (-1.33%)	⬇️
server/schedule/operator_controller.go	84.75% <0.00%> (-0.80%)	⬇️
server/tso/allocator_manager.go	66.44% <0.00%> (-0.67%)	⬇️
... and 10 more

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[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: 21e9001

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3974.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3975.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3976.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3977.