Cleaning up stale ingester metrics #8915

Job	Run time
test	17m 37s
build	3m 51s
lint	15m 55s
CodeQL	6m 34s
integration-configs-db	2m 11s
integration (requires_docker)	5m 52s
integration (integration_alertmanager)	3m 57s
integration (integration_backward_compatibility)	8m 47s
integration (integration_memberlist)	6m 58s
integration (integration_querier)	12m 5s
integration (integration_ruler)	4m 18s
integration (integration_query_fuzz)	2m 28s
deploy_website	0s
deploy	0s
	1h 30m 33s

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