Merge release 1.15 to master #7977

Job	Run time
build	5m 52s
test	17m 55s
lint	31m 13s
integration (requires_docker)	5m 2s
integration-configs-db	1m 54s
integration (integration_alertmanager)	3m 42s
integration (integration_backward_compatibility)	9m 4s
integration (integration_memberlist)	8m 14s
integration (integration_querier)	12m 38s
integration (integration_ruler)	3m 42s
integration (integration_query_fuzz)	1m 46s
deploy_website	0s
deploy	0s
	1h 41m 2s

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