anchor.diff:  ** metrics-server
   ** descheduler
   
  +* *openshift-user-critical* - You can use the `priorityClassName` field with important pods that cannot bind their resource consumption and do not have predictable resource consumption behavior. Prometheus pods under the `openshift-monitoring` and `openshift-user-workload-monitoring` namespaces use the `openshift-user-critical` `priorityClassName`. Monitoring workloads use `system-critical` as their first `priorityClass`, but this causes problems when monitoring uses excessive memory and the nodes cannot evict them. As a result, monitoring drops priority to give the scheduler flexibility, moving heavy workloads around to keep critical nodes operating.
  +
   * *cluster-logging* - This priority is used by Fluentd to make sure Fluentd pods are scheduled to nodes over other apps.
   
   [NOTE]
  
positive.code: 
  You can assign pods a priority class, which is a non-namespaced object that defines a mapping from a name to the integer value of the priority. The higher the value, the higher the priority.
  
  A priority class object can take any 32-bit integer value smaller than or equal to 1000000000 (one billion). Reserve numbers larger than one billion for critical pods that should not be preempted or evicted. By default, {product-title} has two reserved priority classes for critical system pods to have guaranteed scheduling.
  
  [source,terminal]
  ----
  
negative.code: [source,terminal]
  ----
  NAME                      VALUE        GLOBAL-DEFAULT   AGE
  system-node-critical      2000001000   false            72m
  system-cluster-critical   2000000000   false            72m
  openshift-user-critical   1000000000   false            3d13h
  cluster-logging           1000000      false            29s
  ----
  
  * *system-node-critical* - This priority class has a value of 2000001000 and is used for all pods that should never be evicted from a node. Examples of pods that have this priority class are `sdn-ovs`, `sdn`, and so forth. A number of critical components include the `system-node-critical` priority class by default, for example:
  