cockroachdb / cockroachdb/cockroach
changefeedccl: add timer for frontier updates
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Description
We know that the changefeed frontier updates can consume a lot of cpu and take a lot of time for large tables. Let's add a timer metric around that (perhaps conditionally, as a debug setting) to help diagnose these issues without having to get a runtime trace.
Jira issue: CRDB-45167
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