Merge release 1.15 to master #7976

Job	Run time
build	3m 59s
lint	19m 22s
test	17m 50s
integration (requires_docker)	6m 18s
integration-configs-db	1m 51s
integration (integration_alertmanager)	3m 54s
integration (integration_backward_compatibility)	9m 25s
integration (integration_memberlist)	7m 21s
integration (integration_querier)	12m 38s
integration (integration_ruler)	3m 30s
integration (integration_query_fuzz)	1m 50s
deploy_website	0s
deploy	0s
	1h 27m 58s

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