OBSDOCS-1325: Add missing prerequisites

Author: eromanova97

modules/infrastructure-moving-monitoring.adoc

@@ -9,6 +9,12 @@
 The monitoring stack includes multiple components, including Prometheus, Thanos Querier, and Alertmanager.
 The {cmo-full} manages this stack. To redeploy the monitoring stack to infrastructure nodes, you can create and apply a custom config map.
 
+.Prerequisites
+
+* You have access to the cluster as a user with the `cluster-admin` cluster role.
+* You have created the `cluster-monitoring-config` `ConfigMap` object.
+* You have installed the {oc-first}.
+
 .Procedure
 
 . Edit the `cluster-monitoring-config` config map and change the `nodeSelector` to use the `infra` label: