metrics(cdc): fix mq sink write row count metrics. (#4192)#4207

Merged

overvenus merged 4 commits intopingcap:release-5.1from ti-chi-bot:cherry-pick-4192-to-release-5.1

Jan 18, 2022

+13-2

Commits on Jan 4, 2022

This is an automated cherry-pick of pingcap#4192

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Commits on Jan 13, 2022

Merge branch 'release-5.1' into cherry-pick-4192-to-release-5.1
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Commits on Jan 17, 2022

Merge branch 'release-5.1' into cherry-pick-4192-to-release-5.1
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Commits on Jan 18, 2022

fix conflicts.
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