This reports the current global notification severity level currently in effect for a given resource owner sub-type, reflecting which systemwide threshold tier its utilization has most recently crossed. Because this reflects the systemwide threshold configuration rather than a per-user one, it tells an admin the platform-level severity state of a resource pool independent of which specific process might be consuming it. An io memory sub-type showing a current global severity of major indicates that pool's utilization has crossed the systemwide major rising threshold and has not yet fallen back below the corresponding falling threshold.