checker, statistic: avoid leak in label statistic (#8703)#9024

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ti-chi-bot wants to merge 1 commit intotikv:release-6.5from ti-chi-bot:cherry-pick-8703-to-release-6.5

+54-9

Commits on Jan 26, 2025

checker, statistic: avoid leak in label statistic (tikv#8703 ) (tikv#8751 )

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