Add a source label to query stat metrics (#6470) #10951

Job	Run time
test	16m 13s
lint	4m 21s
CodeQL	6m 56s
test-no-race	7m 12s
build	4m 17s
integration-configs-db	2m 56s
integration (requires_docker)	7m 31s
integration (integration_alertmanager)	4m 0s
integration (integration_backward_compatibility)	10m 42s
integration (integration_memberlist)	7m 42s
integration (integration_querier)	15m 13s
integration (integration_ruler)	5m 56s
integration (integration_query_fuzz)	4m 56s
deploy_website	52s
deploy	5m 50s
	1h 44m 37s

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