metrics: make hot split region more readable

[lhy1024]

Signed-off-by: lhy1024 [email protected]

What problem does this PR solve?

Issue Number: Ref #4399

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• bufferflies

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[codecov]

Codecov Report

Merging #5306 (c98171f) into master (8a96807) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5306      +/-   ##
==========================================
+ Coverage   75.75%   75.77%   +0.01%     
==========================================
  Files         311      311              
  Lines       30830    30830              
==========================================
+ Hits        23354    23360       +6     
+ Misses       5480     5473       -7     
- Partials     1996     1997       +1     

Flag	Coverage Δ
unittests	75.77% <0.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
server/schedulers/hot_region.go	83.52% <0.00%> (-0.29%)	⬇️
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
server/storage/endpoint/rule.go	83.33% <0.00%> (-11.12%)	⬇️
pkg/dashboard/adapter/manager.go	74.71% <0.00%> (-4.60%)	⬇️
pkg/etcdutil/etcdutil.go	84.88% <0.00%> (-3.49%)	⬇️
server/election/lease.go	84.05% <0.00%> (-2.90%)	⬇️
server/tso/tso.go	71.75% <0.00%> (-1.70%)	⬇️
server/member/member.go	64.21% <0.00%> (-1.58%)	⬇️
server/region_syncer/client.go	86.56% <0.00%> (-1.50%)	⬇️
server/schedule/placement/rule_manager.go	84.13% <0.00%> (-1.14%)	⬇️
... and 17 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: c98171f