Just like the LimitRange, if you're using the ResourceQuota object to administer a different level of QoS, this plugin must be enabled. The ResourceQuota should always be put at the end of the admission control plugin list. As we mentioned in the ResourceQuota section, ResourceQuota is used to limit the resource usage per namespace. Putting the ResourceQuota controller at the end of the admission controller list could prevent the request from increasing quota usage prematurely if it eventually gets rejected by controllers that are put after it, if any are.