add back note on openshift requirement

Author: gracewehner

articles/azure-monitor/containers/kubernetes-monitoring-enable.md

@@ -43,12 +43,16 @@ This article provides onboarding guidance for the following types of clusters. A
     - Microsoft.AlertsManagement
 
 **Arc-Enabled Kubernetes clusters prerequisites**
-
   - Prerequisites for [Azure Arc-enabled Kubernetes cluster extensions](../../azure-arc/kubernetes/extensions.md#prerequisites).
   - Verify the [firewall requirements](kubernetes-monitoring-firewall.md) in addition to the [Azure Arc-enabled Kubernetes network requirements](../../azure-arc/kubernetes/network-requirements.md).
   - If you previously installed monitoring for AKS, ensure that you have [disabled monitoring](kubernetes-monitoring-disable.md) before proceeding to avoid issues during the extension install.
   - If you previously installed monitoring on a cluster using a script without cluster extensions, follow the instructions at [Disable monitoring of your Kubernetes cluster](kubernetes-monitoring-disable.md) to delete this Helm chart.
 
+> [!NOTE]
+  > The Managed Prometheus Arc-Enabled Kubernetes extension does not support the following configurations:
+  > * Red Hat Openshift distributions
+  > * Windows nodes
+
 
 
 ## Workspaces