Monitor and protect distributor from OOMKilled due to too many in progress requests #8880

Job	Run time
test	21m 4s
lint	18m 15s
build	4m 37s
CodeQL	6m 53s
integration-configs-db	2m 17s
integration (requires_docker)	5m 39s
integration (integration_alertmanager)	3m 51s
integration (integration_backward_compatibility)	9m 20s
integration (integration_memberlist)	7m 53s
integration (integration_querier)	12m 25s
integration (integration_ruler)	4m 24s
integration (integration_query_fuzz)	2m 59s
deploy_website	0s
deploy	0s
	1h 39m 37s

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