cockroachdb / cockroachdb/cockroach
changefeedccl: investigate why max_behind_nanos sometimes goes to 0 during catchup scans
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Description
In an [investigation](https://cockroachlabs.slack.com/archives/C06QB018DQE/p1711394786306509?thread_ts=1711290763.535259&cid=C06QB018DQE) we observed changefeed.max_behind_nanos go to 0 when in catchup mode. This behavior seems unexpected and undesirable, so we should investigate why this happens even though this metric is deprecated in favor of other metrics.
Jira issue: CRDB-37048
Epic CRDB-37337
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