metrics: fix the residual label (#4824)

[ti-chi-bot]

This is an automated cherry-pick of #4824

Signed-off-by: Ryan Leung [email protected]

What problem does this PR solve?

Issue Number: Close #4825.

What is changed and how it works?

Before collecting the metrics, reset the placementStatusGauge

Check List

Tests

• Manual test (the detailed steps can be found in the above issue)

Release note

Fix the issue that the label distribution has residual labels

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[codecov]

Codecov Report

Merging #4831 (7711383) into release-5.3 (b99630d) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-5.3    #4831      +/-   ##
===============================================
- Coverage        74.91%   74.77%   -0.15%     
===============================================
  Files              263      263              
  Lines            27329    27330       +1     
===============================================
- Hits             20473    20435      -38     
- Misses            5040     5066      +26     
- Partials          1816     1829      +13     

Flag	Coverage Δ
unittests	74.77% <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/store_collection.go	93.70% <100.00%> (+0.04%)	⬆️
server/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
server/tso/tso.go	59.09% <0.00%> (-9.66%)	⬇️
server/tso/local_allocator.go	64.86% <0.00%> (-6.76%)	⬇️
server/tso/allocator_manager.go	62.83% <0.00%> (-3.34%)	⬇️
server/election/leadership.go	75.25% <0.00%> (-2.07%)	⬇️
server/schedule/operator_controller.go	83.02% <0.00%> (-2.05%)	⬇️
server/member/member.go	63.10% <0.00%> (-1.61%)	⬇️
server/tso/global_allocator.go	60.84% <0.00%> (-1.06%)	⬇️
server/region_syncer/client.go	78.90% <0.00%> (-0.79%)	⬇️
... and 12 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: 7711383