Updated doc per feedback

Author: schaffererin

articles/aks/best-practices-app-cluster-reliability.md

@@ -390,9 +390,9 @@ For more information, see [Use the cluster autoscaler on node pools](./cluster-a
 
 > **Best practice guidance**
 >
-> Ensure that system node pools have at least two nodes to ensure resiliency against freeze/upgrade scenarios, which can lead to nodes being restarted or shut down.
+> Ensure that system node pools have at least three nodes to ensure resiliency against freeze/upgrade scenarios, which can lead to nodes being restarted or shut down.
 
-System node pools are used to run system pods, such as the kube-proxy, coredns, and the Azure CNI plugin. We recommend that you ***ensure that system node pools have at least two nodes*** to ensure resiliency against freeze/upgrade scenarios, which can lead to nodes being restarted or shut down. For more information, see [Manage system node pools in AKS](./use-system-pools.md).
+System node pools are used to run system pods, such as the kube-proxy, coredns, and the Azure CNI plugin. We recommend that you ***ensure that system node pools have at least three nodes*** to ensure resiliency against freeze/upgrade scenarios, which can lead to nodes being restarted or shut down. For more information, see [Manage system node pools in AKS](./use-system-pools.md).
 
 ### Accelerated Networking