added note about npm retirement

Author: asudbring

articles/networking/network-monitoring-overview.md

@@ -4,13 +4,18 @@ description: Overview of network monitoring solutions, including network perform
 author: asudbring
 ms.service: virtual-network
 ms.topic: article
-ms.date: 03/23/2023
+ms.date: 10/30/2023
 ms.author: allensu
 ---
 # Network monitoring solutions 
 
 Azure offers a host of solutions to monitor your networking assets. Azure has solutions and utilities to monitor network connectivity, the health of ExpressRoute circuits, and analyze network traffic in the cloud.
 
+> [!IMPORTANT]
+> As of July 1, 2021, you can no longer add new tests in an existing workspace or enable a new workspace in Network Performance Monitor (NPM). You're also no longer able to add new connection monitors in Connection Monitor (Classic). You can continue to use the tests and connection monitors that you've created prior to July 1, 2021. 
+> 
+> To minimize service disruption to your current workloads, [migrate your tests from Network Performance Monitor](migrate-to-connection-monitor-from-network-performance-monitor.md), or  [migrate from Connection Monitor (Classic)](migrate-to-connection-monitor-from-connection-monitor-classic.md) to the new Connection Monitor in Azure Network Watcher before February 29, 2024.
+
 ## Network Performance Monitor
 
 Network Performance Monitor is a suite of capabilities that is geared towards monitoring the health of your network. Network Performance Monitor monitors network connectivity to your applications, and provides insights into the performance of your network. Network Performance Monitor is cloud-based and provides a hybrid network monitoring solution that monitors connectivity between: