*: add variable to control async merge global stats (#47806)#47880

Merged

ti-chi-bot[bot] merged 1 commit intopingcap:release-7.5from ti-chi-bot:cherry-pick-47806-to-release-7.5

Oct 26, 2023

+258-12

Commits on Oct 26, 2023

This is an automated cherry-pick of pingcap#47806
hawkingrei
committed