schedulers: evict-leader supports schedule the regions with unhealthy peers (#4096)

[ti-chi-bot]

This is an automated cherry-pick of #4096

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

What problem does this PR solve?

close #4093

What is changed and how it works?

schedulers: evict-leader supports schedule the regions with unhealthy peers

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

`evict-leader-scheduler` supports schedule the regions with unhealthy peers.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch

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[codecov]

Codecov Report

Merging #4133 (ba98fc5) into release-4.0 (08bd389) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           release-4.0    #4133   +/-   ##
============================================
  Coverage        74.95%   74.95%           
============================================
  Files              211      211           
  Lines            20073    20081    +8     
============================================
+ Hits             15045    15052    +7     
- Misses            3697     3699    +2     
+ Partials          1331     1330    -1     

Flag	Coverage Δ
unittests	74.95% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
server/schedulers/evict_leader.go	75.00% <100.00%> (+1.00%)	⬆️
server/schedulers/random_merge.go	61.29% <0.00%> (-3.23%)	⬇️
server/member/leader.go	65.13% <0.00%> (-3.22%)	⬇️
pkg/etcdutil/etcdutil.go	72.05% <0.00%> (-2.95%)	⬇️
pkg/mock/mockhbstream/mockhbstream.go	87.03% <0.00%> (-1.86%)	⬇️
server/server.go	72.81% <0.00%> (-1.46%)	⬇️
server/grpc_service.go	59.07% <0.00%> (-1.21%)	⬇️
server/cluster/cluster.go	76.89% <0.00%> (-0.26%)	⬇️
pkg/dashboard/adapter/manager.go	85.10% <0.00%> (ø)
client/client.go	69.54% <0.00%> (+0.50%)	⬆️
... and 8 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: ba98fc5