Merge pull request #229402 from seligj95/patch-1

add SLA note for AZ app service

Author: prmerger-automator[bot]

articles/reliability/migrate-app-service.md

@@ -5,7 +5,7 @@ description: Learn how to migrate Azure App Service to availability zone support
 author: anaharris-ms
 ms.service: app-service
 ms.topic: conceptual
-ms.date: 02/13/2023
+ms.date: 03/03/2023
 ms.author: anaharris
 ms.reviewer: jordanselig
 ms.custom: references_regions, subject-reliability
@@ -24,6 +24,11 @@ An App Service lives in an App Service plan (ASP), and the App Service plan exis
 
 - For App Services that are configured to be zone redundant, the platform automatically spreads the VM instances in the App Service plan across all three zones in the selected region. If a VM instance capacity larger than three is specified and the number of instances is a multiple of three (3 * N), the instances will be spread evenly. However, if the number of instances is not a multiple of three, the remainder of the instances will get spread across the remaining one or two zones.
 
+> [!NOTE]
+> [App Service SLA](https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services?lang=1) is calculated based on the Maximum Available Minutes and Downtime which is standard irrespective of availability zone enablement. Downtime for the App Service is defined as the following.
+>
+> “Downtime: The total accumulated Deployment Minutes, across all Apps deployed by Customer in a given Microsoft Azure subscription, during which the App is unavailable. A minute is considered unavailable for a given App when there is no connectivity between the App and Microsoft’s Internet gateway.”
+
 ## Prerequisites
 
 Availability zone support is a property of the App Service plan. The following are the current requirements/limitations for enabling availability zones: