Update schema-csdef-networktrafficrules.md

Author: hirenshah1

articles/cloud-services-extended-support/schema-csdef-networktrafficrules.md

@@ -12,6 +12,9 @@ ms.reviewer: mimckitt
 
 # Azure Cloud Services (extended support) definition NetworkTrafficRules schema
 
+> [!IMPORTANT]
+> As of March 31, 2025, cloud Services (classic) is deprecated and will be fully retired on March 31, 2027. [Learn more](https://aka.ms/csesretirement) about this deprecation and [how to migrate](https://aka.ms/cses-retirement-march-2025).
+
 The `NetworkTrafficRules` node is an optional element in the service definition file that specifies how roles communicate with each other. It limits which roles can access the internal endpoints of the specific role. The `NetworkTrafficRules` isn't a standalone element; it's combined with two or more roles in a service definition file.
 
 The default extension for the service definition file is csdef.