schedule: add metrcis for region scatter (#3582)

[ti-srebot]

cherry-pick #3582 to release-5.0
You can switch your code base to this Pull Request by using git-extras:

# In pd repo:
git pr https://github.com/tikv/pd/pull/3596

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/pd.git pr/3596:release-5.0-b8c3d1445bb7

---

Signed-off-by: yisaer disxiaofei@163.com

What problem does this PR solve?

Add metrics in region scatter

What is changed and how it works?

Release note

• No release note

[ti-srebot]

@Yisaer you're already a collaborator in bot's repo.

[codecov]

Codecov Report

Merging #3596 (228a48c) into release-5.0 (a811014) will increase coverage by 0.07%.
The diff coverage is 81.81%.

@@               Coverage Diff               @@
##           release-5.0    #3596      +/-   ##
===============================================
+ Coverage        74.49%   74.57%   +0.07%     
===============================================
  Files              245      245              
  Lines            24094    24122      +28     
===============================================
+ Hits             17950    17988      +38     
+ Misses            4526     4519       -7     
+ Partials          1618     1615       -3     

Flag	Coverage Δ
unittests	74.57% <81.81%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/region_scatterer.go	87.04% <80.00%> (-1.58%)	⬇️
server/schedule/filter/filters.go	90.76% <100.00%> (ø)
server/schedule/metrics.go	100.00% <100.00%> (ø)
pkg/tempurl/tempurl.go	60.00% <0.00%> (-10.00%)	⬇️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
server/schedulers/random_merge.go	60.00% <0.00%> (-3.34%)	⬇️
server/schedulers/utils.go	93.10% <0.00%> (-1.38%)	⬇️
server/core/storage.go	67.68% <0.00%> (-0.77%)	⬇️
server/cluster/cluster.go	82.92% <0.00%> (-0.49%)	⬇️
server/grpc_service.go	47.62% <0.00%> (-0.23%)	⬇️
... and 8 more

---

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[Yisaer]

/merge

[ti-chi-bot]

@Yisaer: 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]

@Yisaer: /merge in this pull request requires 2 /lgtm.

Details

In response to this:

/merge

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Yisaer
• nolouch

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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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

Details

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.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Details

Commit hash: 0a8854d

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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