Add distributor per labelset received samples metric (#6443) #1925

Job	Run time
lint	4m 26s
build	4m 1s
CodeQL	7m 2s
test	15m 55s
test-no-race	7m 37s
integration-configs-db	2m 58s
integration (requires_docker)	7m 33s
integration (integration_alertmanager)	4m 9s
integration (integration_backward_compatibility)	10m 32s
integration (integration_memberlist)	8m 15s
integration (integration_querier)	15m 42s
integration (integration_ruler)	5m 57s
integration (integration_query_fuzz)	4m 49s
deploy_website	0s
deploy	0s
	1h 38m 56s

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