Monitor and protect distributor from OOMKilled due to too many in progress requests #8875

Job	Run time
build	4m 15s
CodeQL	6m 55s
lint	16m 21s
test	17m 52s
integration-configs-db	2m 16s
integration (requires_docker)	5m 59s
integration (integration_alertmanager)	3m 53s
integration (integration_backward_compatibility)	9m 9s
integration (integration_memberlist)	7m 42s
integration (integration_querier)	12m 20s
integration (integration_ruler)	4m 23s
integration (integration_query_fuzz)	2m 30s
deploy	0s
deploy_website	0s
	1h 33m 35s

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