*: add warn log for stale read (#30340)#30350

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ti-srebot wants to merge 1 commit intopingcap:release-5.2from ti-srebot:release-5.2-6475e8949cf4

+15-5

Commits on Dec 2, 2021

cherry pick pingcap#30340 to release-5.2

Yisaer
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ti-srebot
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