br: make download metadata concurrency adjustable (#45639)#46109

Merged

ti-chi-bot[bot] merged 4 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-45639-to-release-6.5

Aug 17, 2023

+58-122

Commits on Aug 15, 2023

This is an automated cherry-pick of pingcap#45639

Leavrth
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resolve conflicts
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Commits on Aug 16, 2023

Merge branch 'release-6.5' into cherry-pick-45639-to-release-6.5
Leavrth
committed

Commits on Aug 17, 2023

Merge branch 'release-6.5' into cherry-pick-45639-to-release-6.5
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