metrics: add witness count

[ethercflow]

ref #5568

Signed-off-by: Wenbo Zhang [email protected]

What problem does this PR solve?

Issue Number: ref #5568

What is changed and how does it work?

Check List

Tests

• Manual test (add detailed scripts or steps below)
• No code

Code changes

• None

Side effects

• None

Related changes

• None

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Connor1996
• lhy1024

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[codecov]

Codecov Report

Base: 75.72% // Head: 75.87% // Increases project coverage by +0.15% 🎉

Coverage data is based on head (9775451) compared to base (01b2fb5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5890      +/-   ##
==========================================
+ Coverage   75.72%   75.87%   +0.15%     
==========================================
  Files         342      342              
  Lines       34847    34850       +3     
==========================================
+ Hits        26387    26444      +57     
+ Misses       6220     6175      -45     
+ Partials     2240     2231       -9     

Flag	Coverage Δ
unittests	75.87% <100.00%> (+0.15%)	⬆️

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

Impacted Files	Coverage Δ
server/statistics/region_collection.go	97.52% <100.00%> (+0.03%)	⬆️
pkg/storage/endpoint/meta.go	63.63% <0.00%> (-6.82%)	⬇️
tools/pd-ctl/pdctl/command/operator.go	66.66% <0.00%> (-1.15%)	⬇️
pkg/btree/btree_generic.go	86.34% <0.00%> (-0.93%)	⬇️
server/cluster/cluster.go	81.67% <0.00%> (-0.69%)	⬇️
pkg/member/member.go	63.68% <0.00%> (-0.53%)	⬇️
server/handler.go	52.88% <0.00%> (-0.39%)	⬇️
server/cluster/unsafe_recovery_controller.go	78.70% <0.00%> (-0.35%)	⬇️
client/client.go	70.79% <0.00%> (+0.10%)	⬆️
server/cluster/coordinator.go	72.34% <0.00%> (+0.37%)	⬆️
... and 15 more

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[Connor1996]

LGTM

[bufferflies]

how about add some picture about this changes ?

[bufferflies]

/merge

[ti-chi-bot]

@bufferflies: 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: d11a5b7

[ti-chi-bot]

@ethercflow: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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.