Update eviction strategy to include priority (#6949)

docs/tasks/administer-cluster/out-of-resource.md

@@ -196,25 +196,22 @@ If `nodefs` filesystem has met eviction thresholds, `kubelet` frees up disk spac
 
 If the `kubelet` is unable to reclaim sufficient resource on the node, `kubelet` begins evicting Pods.
 
-The `kubelet` ranks Pods for eviction first by their quality of service, and then by the consumption
-of the starved compute resource relative to the Pods' scheduling requests.
-
-As a result, `kubectl` ranks and evicts Pods in the following order:
-
-* `BestEffort` Pods consume the most of the starved resource are failed first.
-Local disk is a `BestEffort` resource.
-* `Burstable` Pods consume the greatest amount of the starved resource
-relative to their request for that resource are killed first. If no Pod
-has exceeded its request, the strategy targets the largest consumer of the
-starved resource.
-* `Guaranteed` Pods are guaranteed only when requests and limits are specified
-for all the containers and they are equal. A `Guaranteed` Pod is guaranteed to
-never be evicted because of another Pod's resource consumption. If a system
-daemon (such as `kubelet`, `docker`, and `journald`) is consuming more resources
-than were reserved via `system-reserved` or `kube-reserved` allocations, and the
-node only has `Guaranteed` Pods remaining, then the node must choose to evict a
-`Guaranteed` Pod in order to preserve node stability and to limit the impact
-of the unexpected consumption to other `Guaranteed` Pods.
+The `kubelet` ranks Pods for eviction first by whether or not their usage  of the starved resource exceeds requests, 
+then by [Priority](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/), and then by the consumption of the starved compute resource relative to the Pods' scheduling requests.
+
+As a result, `kubelet` ranks and evicts Pods in the following order:
+
+* `BestEffort` or `Burstable` Pods whose usage of a starved resource exceeds its request.
+Such pods are ranked by Priority, and then usage above request.
+* `Guaranteed` pods and `Burstable` pods whose usage is beneath requests are evicted last.
+`Guaranteed` Pods are guaranteed only when requests and limits are specified for all 
+the containers and they are equal. Such pods are guaranteed to never be evicted because 
+of another Pod's resource consumption. If a system daemon (such as `kubelet`, `docker`,
+and `journald`) is consuming more resources than were reserved via `system-reserved` or
+`kube-reserved` allocations, and the node only has `Guaranteed` or `Burstable` Pods using 
+less than requests remaining, then the node must choose to evict such a Pod in order to 
+preserve node stability and to limit the impact of the unexpected consumption to other Pods.
+In this case, it will choose to evict pods of Lowest Priority first.
 
 If necessary, `kubelet` evicts Pods one at a time to reclaim disk when `DiskPressure`
 is encountered. If the `kubelet` is responding to `inode` starvation, it reclaims