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:

• bufferflies
• lhy1024

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[rleungx]

/run-unit-tests

[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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: f03d587

[codecov]

Codecov Report

Merging #4826 (df39baf) into release-5.4 (eed291d) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-5.4    #4826      +/-   ##
===============================================
+ Coverage        74.64%   74.69%   +0.04%     
===============================================
  Files              265      265              
  Lines            27963    27964       +1     
===============================================
+ Hits             20874    20888      +14     
+ Misses            5220     5210      -10     
+ Partials          1869     1866       -3     

Flag	Coverage Δ
unittests	74.69% <100.00%> (+0.04%)	⬆️

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%)	⬆️
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
server/tso/local_allocator.go	64.86% <0.00%> (-6.76%)	⬇️
server/schedulers/random_merge.go	60.00% <0.00%> (-3.34%)	⬇️
server/schedule/operator_controller.go	83.02% <0.00%> (-1.23%)	⬇️
pkg/btree/btree.go	85.78% <0.00%> (-0.97%)	⬇️
server/tso/allocator_manager.go	65.39% <0.00%> (-0.84%)	⬇️
server/region_syncer/client.go	78.90% <0.00%> (-0.79%)	⬇️
client/client.go	72.83% <0.00%> (+0.10%)	⬆️
server/server.go	71.85% <0.00%> (+0.14%)	⬆️
... and 7 more

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