statistics: unify the length of Loads in hot statistics to 3

[HunDunDM]

What problem does this PR solve?

Issue Number: Close #5500

What is changed and how does it work?

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

Release note

None

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This pull request has been approved by:

• lhy1024
• nolouch

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[codecov]

Codecov Report

Base: 75.56% // Head: 75.65% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (b8f5afb) compared to base (5ac8256).
Patch coverage: 89.74% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5501      +/-   ##
==========================================
+ Coverage   75.56%   75.65%   +0.09%     
==========================================
  Files         321      321              
  Lines       31866    31855      -11     
==========================================
+ Hits        24078    24101      +23     
+ Misses       5712     5679      -33     
+ Partials     2076     2075       -1     

Flag	Coverage Δ
unittests	75.65% <89.74%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
server/statistics/hot_cache.go	90.27% <ø> (ø)
server/statistics/hot_cache_task.go	86.36% <ø> (ø)
server/cluster/coordinator.go	71.11% <62.50%> (-0.83%)	⬇️
server/statistics/kind.go	40.00% <83.33%> (+5.62%)	⬆️
server/cluster/cluster.go	83.54% <100.00%> (+0.44%)	⬆️
server/schedulers/hot_region.go	85.51% <100.00%> (-0.28%)	⬇️
server/statistics/buckets/bucket_stat_informer.go	94.28% <100.00%> (+0.08%)	⬆️
server/statistics/hot_peer.go	97.05% <100.00%> (+0.04%)	⬆️
server/statistics/hot_peer_cache.go	96.87% <100.00%> (-0.04%)	⬇️
server/statistics/store_hot_peers_infos.go	100.00% <100.00%> (ø)
... and 30 more

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[lhy1024]

Will it be the same? cc @bufferflies

[rleungx]

Why do we need to make a copy in the init function?

[HunDunDM]

Their values are the same.

[nolouch]

lgtm

[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: It seems you want to merge this PR, I will help you trigger all the tests:

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 08f4b69

[ti-chi-bot]

@HunDunDM: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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