statistics: make aot more stable

[lhy1024]

Signed-off-by: lhy1024 [email protected]

What problem does this PR solve?

Issue Number: Ref #4949

What is changed and how does it work?

If DefaultAotSize is 2, a random fluctuation will affect two interval.

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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[codecov]

Codecov Report

Merging #4951 (04e9c42) into master (d6557df) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4951      +/-   ##
==========================================
+ Coverage   75.18%   75.25%   +0.06%     
==========================================
  Files         297      297              
  Lines       29492    29497       +5     
==========================================
+ Hits        22173    22197      +24     
+ Misses       5369     5354      -15     
+ Partials     1950     1946       -4     

Flag	Coverage Δ
unittests	75.25% <100.00%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
server/statistics/util.go	100.00% <ø> (ø)
server/cluster/cluster.go	83.04% <100.00%> (+0.31%)	⬆️
server/core/basic_cluster.go	91.14% <100.00%> (+0.14%)	⬆️
server/storage/leveldb_backend.go	76.00% <0.00%> (-8.00%)	⬇️
client/base_client.go	79.89% <0.00%> (-2.07%)	⬇️
server/member/member.go	64.21% <0.00%> (-1.58%)	⬇️
server/region_syncer/client.go	84.21% <0.00%> (-1.51%)	⬇️
server/election/lease.go	84.05% <0.00%> (-1.45%)	⬇️
server/schedule/operator_controller.go	84.47% <0.00%> (-1.21%)	⬇️
server/region_syncer/server.go	79.89% <0.00%> (-1.09%)	⬇️
... and 16 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: 66ec8eb