scheduler: consider evict leader when calc expect (#3967)

[ti-chi-bot]

This is an automated cherry-pick of #3967

Signed-off-by: lhy1024 [email protected]

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]

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• HunDunDM
• Yisaer

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[purelind]

/run-build

[purelind]

/run-unit-test

[purelind]

/rebuild

[purelind]

/rebuild

[nolouch]

/merg

[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: 6d2e925

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-5.2@70274be). Click here to learn what that means.
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❗ Current head caa5d7a differs from pull request most recent head 423f7ad. Consider uploading reports for the commit 423f7ad to get more accurate results

@@              Coverage Diff               @@
##             release-5.2    #3977   +/-   ##
==============================================
  Coverage               ?   74.55%           
==============================================
  Files                  ?      248           
  Lines                  ?    25484           
  Branches               ?        0           
==============================================
  Hits                   ?    18999           
  Misses                 ?     4791           
  Partials               ?     1694           

Flag	Coverage Δ
unittests	74.55% <0.00%> (?)

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[nolouch]

/rebuild

[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.