Support exemplar federated query #10821

Job	Run time
CodeQL	7m 7s
CodeQL	7m 7s
build	4m 16s
build	4m 16s
lint	4m 19s
lint	4m 19s
test	15m 52s
test	15m 52s
test-no-race	7m 8s
test-no-race	7m 26s
integration-configs-db	2m 48s
integration-configs-db	2m 48s
integration (requires_docker)	7m 12s
integration (requires_docker)	7m 12s
integration (integration_alertmanager)	4m 10s
integration (integration_alertmanager)	4m 10s
integration (integration_backward_compatibility)	10m 43s
integration (integration_backward_compatibility)	10m 43s
integration (integration_memberlist)	7m 39s
integration (integration_memberlist)	7m 39s
integration (integration_querier)	15m 21s
integration (integration_querier)	15m 21s
integration (integration_ruler)	5m 37s
integration (integration_ruler)	5m 37s
integration (integration_query_fuzz)	5m 5s
integration (integration_query_fuzz)	5m 5s
deploy_website	0s
deploy_website	0s
deploy	0s
deploy	0s
	3h 14m 52s

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