statistics: ease the impact of stats feedback on cluster (#15503)#18772

Merged

eurekaka merged 3 commits intopingcap:release-4.0from ti-srebot:release-4.0-a99fdc098cb3

Jul 27, 2020

+276-129

Commits on Jul 24, 2020

cherry pick pingcap#15503 to release-4.0

eurekaka
authored and
ti-srebot
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Commits on Jul 27, 2020