Update sample-update-cloud-service.md

Author: hirenshah1

articles/cloud-services-extended-support/sample-update-cloud-service.md

@@ -13,6 +13,9 @@ ms.custom: devx-track-azurepowershell
 
 # Update an Azure Cloud Service (extended support)
 
+> [!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).
+
 These samples cover various ways to update an existing Azure Cloud Service (extended support) deployment.
 
 ## Add an extension to existing Cloud Service