statistics: fix anticount and cold peer statistics

[lhy1024]

Signed-off-by: lhy1024 admin@liudos.us

What problem does this PR solve?

Issue Number: Close #5478

What is changed and how does it work?

1. The cold peer needs to wait the same time as the cooling interval before being activated again

2. For unreported peers, the padding load uses 0 instead of the threshold

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• nolouch

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[Yui-Song]

/run-build-arm64 comment=true

[nolouch]

@lhy1024 ci failed.

[lhy1024]

/run-build-arm64 comment=true

[lhy1024]

/run-build-arm64 comment=true

[purelind]

/run-build-arm64 comment=true

[sre-bot]

download pd binary(linux arm64) at http://fileserver.pingcap.net/download/builds/pingcap/test/pd/92149ac4f7690fd6b83930171b97f410eb2c3e2b/centos7/pd-linux-arm64.tar.gz

[codecov]

Codecov Report

Base: 75.67% // Head: 75.64% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (0e7e31b) compared to base (86262da).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5479      +/-   ##
==========================================
- Coverage   75.67%   75.64%   -0.03%     
==========================================
  Files         320      320              
  Lines       31640    31642       +2     
==========================================
- Hits        23944    23937       -7     
- Misses       5640     5648       +8     
- Partials     2056     2057       +1     

Flag	Coverage Δ
unittests	75.64% <100.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
server/statistics/hot_peer.go	97.01% <100.00%> (+0.13%)	⬆️
server/statistics/hot_peer_cache.go	96.91% <100.00%> (-0.02%)	⬇️
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
server/tso/local_allocator.go	71.62% <0.00%> (-6.76%)	⬇️
server/tso/allocator_manager.go	62.50% <0.00%> (-1.79%)	⬇️
server/region_syncer/client.go	86.56% <0.00%> (-1.50%)	⬇️
server/tso/tso.go	69.66% <0.00%> (-1.13%)	⬇️
server/region_syncer/server.go	86.26% <0.00%> (-1.10%)	⬇️
server/schedule/operator/step.go	77.77% <0.00%> (-0.86%)	⬇️
server/cluster/coordinator.go	71.00% <0.00%> (-0.56%)	⬇️
... and 8 more

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[nolouch]

lgtm

[HunDunDM]

/merge

[ti-chi-bot]

@HunDunDM: 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: 0e7e31b