Merge pull request #307355 from seligj95/asezr

ASE ZR - add scaling note

Author: prmerger-automator[bot]

articles/app-service/environment/configure-zone-redundancy-environment.md

@@ -3,7 +3,7 @@ title: Configure App Service Environments and Isolated v2 App Service Plans for
 description: Learn how to configure zone redundancy for App Service Environments and Isolated v2 App Service plans to boost reliability and minimize service disruption.
 ms.topic: conceptual
 ms.service: azure-app-service
-ms.date: 07/16/2025
+ms.date: 10/24/2025
 author: anaharris
 ms.author: anaharris
 
@@ -67,7 +67,7 @@ For more information about zone redundancy, see [Reliability in an App Service E
     ---
     
     > [!NOTE]
-    > A zone redundancy status change in an App Service Environment takes 12 to 24 hours to complete. During the upgrade process, no downtime or performance problems occur.
+    > A zone redundancy status change in an App Service Environment takes 12 to 24 hours to complete. During the upgrade process, no downtime or performance problems occur. However, all App Service plans with fewer than 3 instances are scaled to 3 instances. Any plan with 3 or more instances remains unchanged. Once the operation to enable zone redundancy completes, you can scale your App Service plans as needed, including to fewer than 3 instances.
 
 ### Check for zone redundancy support for an App Service Environment
 

articles/reliability/reliability-app-service-environment.md

@@ -6,7 +6,7 @@ ms.author: anaharris
 ms.topic: reliability-article
 ms.custom: subject-reliability
 ms.service: azure-app-service
-ms.date: 07/17/2025
+ms.date: 10/24/2025
 
 #Customer intent: As an engineer responsible for business continuity, I want to understand the details of how an App Service Environment works from a reliability perspective and plan resiliency strategies in alignment with the exact processes that Azure services follow during different kinds of situations.
 ---
@@ -95,6 +95,9 @@ You can enable zone redundancy on an App Service Environment or its plans at no
 
 If you enable availability zones but specify a capacity of fewer than two instances, the platform enforces a minimum instance of two. The platform charges you for those two instances.
 
+> [!IMPORTANT]
+> When you enable availability zones for an App Service Environment, all App Service plans with fewer than 3 instances are scaled to 3 instances. Any plan with 3 or more instances remains unchanged. Once the operation to enable availability zones completes, you can scale your App Service plans as needed, including to fewer than 3 instances.
+
 ### Configure availability zone support
 
 To learn how to create, enable, or disable a new zone-redundant App Service Environment and new zone-redundant App Service plans, see [Configure App Service Environments and Isolated v2 App Service plans for zone redundancy](../app-service/environment/configure-zone-redundancy-environment.md).