Add source label to query stats metrics #10864

Job	Run time
test-no-race	7m 17s
lint	4m 21s
build	4m 4s
CodeQL	6m 32s
test	37m 48s
integration-configs-db	2m 48s
integration (requires_docker)	7m 19s
integration (integration_alertmanager)	4m 13s
integration (integration_backward_compatibility)	10m 26s
integration (integration_memberlist)	7m 23s
integration (integration_querier)	15m 21s
integration (integration_ruler)	5m 46s
integration (integration_query_fuzz)	4m 57s
deploy_website	0s
deploy	0s
	1h 58m 15s

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