pump/storge: Measure time taken to write to disk, to rotate and fsync (#773) #784
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cherry-pick #773 to release-3.1
What problem does this PR solve?
We only measurer the time taken to write a batch of binlogs at the top level.
But we have no other measurementt to help us figure out which step is taking up most of the time.
What is changed and how it works?
Add 3 metrics:
Check List
Tests
Code changes
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tidb-ansiblerepository