Update cnf-best-practices-expectations-permissions.adoc

Author: mwlinca

modules/cnf-best-practices-expectations-permissions.adoc

@@ -390,6 +390,8 @@ When managing the platform there are at least two types of disruptions that can
 
 maintenance and the node has to be drained. If there is a pod disruption budget set then OpenShift will respect that and ensure that the required number of pods are available by bringing up pods on different nodes before draining the current node.
 
+See test case link:https://github.com/test-network-function/cnf-certification-test/blob/main/CATALOG.md#observability-pod-disruption-budget[observability-pod-disruption-budget]
+
 [id="cnf-best-practices-no-naked-pods"]
 ==== No naked pods