cockroachdb / cockroachdb/cockroach
changefeedccl: scoped changefeed metrics don't go away when the feed with that label goes away
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Description
When a feed with a metrics_label is deleted, the prometheus metrics with that scope in `_status/vars` don't get deleted. This is a problem for customers as the metrics are still reported and can inflate their cardinality cost in their observability systems. Some metrics aren't even zero'd, which can cause spurious alerts and poor DX.
Jira issue: CRDB-46981
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