stats: remove the lower bound of auto analyze ratio (#13995)#14015

Merged

sre-bot merged 3 commits intopingcap:release-3.0from alivxxx:ratio-3.0

Dec 12, 2019

+19-20

Commits on Dec 10, 2019

Commits on Dec 12, 2019

Merge branch 'release-3.0' into ratio-3.0
sre-bot
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