Added Azure Monitor for auto scale

Author: omidm1

articles/hdinsight/hdinsight-restrict-outbound-traffic.md

@@ -110,7 +110,8 @@ Create the network rules to correctly configure your HDInsight cluster.
     | Name | Protocol | Source Addresses | Service Tags | Destination Ports | Notes |
     | --- | --- | --- | --- | --- | --- |
     | Rule_7 | TCP | * | SQL | 1433 | Configure a network rule in the Service Tags section for SQL that will allow you to log and audit SQL traffic. Unless you configured Service Endpoints for SQL Server on the HDInsight subnet, which will bypass the firewall. |
-
+    | Rule_8 | TCP | * | Azure Monitor | * | (optional) Customers who plan to use auto scale feature should add this rule. |
+    
    ![Title: Enter application rule collection](./media/hdinsight-restrict-outbound-traffic/hdinsight-restrict-outbound-traffic-add-network-rule-collection.png)
 
 1. Select **Add**.
@@ -186,4 +187,4 @@ To use the public endpoint (`https://CLUSTERNAME.azurehdinsight.net`) or ssh end
 ## Next steps
 
 * [Azure HDInsight virtual network architecture](hdinsight-virtual-network-architecture.md)
-* [Configure network virtual appliance](./network-virtual-appliance.md)
+* [Configure network virtual appliance](./network-virtual-appliance.md)