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]

This pull request has been approved by:

• HunDunDM
• nolouch

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[lhy1024]

it will wait until cherry-pick of #3870 merged

[codecov]

Codecov Report

Merging #3974 (3c3265e) into release-4.0 (d45165b) will increase coverage by 0.02%.
The diff coverage is 75.00%.

@@               Coverage Diff               @@
##           release-4.0    #3974      +/-   ##
===============================================
+ Coverage        74.73%   74.75%   +0.02%     
===============================================
  Files              211      211              
  Lines            20020    20028       +8     
===============================================
+ Hits             14962    14972      +10     
- Misses            3720     3725       +5     
+ Partials          1338     1331       -7     

Flag	Coverage Δ
unittests	74.75% <75.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
pkg/mock/mockcluster/mockcluster.go	92.56% <66.66%> (-0.50%)	⬇️
server/schedulers/hot_region.go	80.92% <100.00%> (+0.05%)	⬆️
server/schedulers/shuffle_hot_region.go	57.14% <0.00%> (-12.50%)	⬇️
server/member/leader.go	65.13% <0.00%> (-0.92%)	⬇️
client/client.go	69.03% <0.00%> (-0.51%)	⬇️
server/grpc_service.go	59.07% <0.00%> (-0.41%)	⬇️
server/cluster/cluster.go	78.60% <0.00%> (+0.47%)	⬆️
server/core/storage.go	68.39% <0.00%> (+0.86%)	⬆️
server/server.go	74.75% <0.00%> (+1.94%)	⬆️
server/schedule/operator/step.go	64.02% <0.00%> (+2.15%)	⬆️
... and 1 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: 7f5012a