Revert "statistics: fix empty region count when resuming (#7009) (#70…

[CabinfeverB]

…55)"

This reverts commit 8c5859e.

What problem does this PR solve?

Issue Number: ref #7148

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• lhy1024

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Files	Coverage Δ
server/cluster/cluster.go	81.38% <100.00%> (-0.02%)	⬇️
server/core/region.go	90.24% <100.00%> (+0.05%)	⬆️
server/statistics/region.go	100.00% <100.00%> (ø)
server/statistics/region_collection.go	97.48% <100.00%> (ø)

... and 19 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.

[CabinfeverB]

/merge

[ti-chi-bot]

@CabinfeverB: 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: 727ab1e