Add throttling errors section and related image to known issues documentation (#36656)

Author: MikeRayMSFT

docs/sql-server/azure-arc/known-issues.md

@@ -32,6 +32,18 @@ If a database isn't online and updatable, required permissions aren't assigned t
 
 Currently `Microsoft.AzureArcData` tags are not included in cost reports. For updates, review [Microsoft.AzureArcData tag support](/azure/azure-resource-manager/management/tag-support#microsoftazurearcdata)
 
+## Throttling errors
+
+You might occasionally see throttling notifications for Azure resource updates in Activity log, as shown below. This behavior is expected due to service-imposed rate limits. Updates for SQL Server instances, databases, and availability groups inventory run continuously on an hourly basis and should eventually complete successfully.
+
+:::image type="content" source="media/known-issues/throttling-error-notification.png" alt-text="Screenshot of throttling error notification in Activity log." lightbox="media/known-issues/throttling-error-notification.png":::
+
+Contact the support team for assistance if you:
+
+- Encounter these errors repeatedly
+- Notice data inconsistencies in Azure for your SQL Server instances, databases, or availability groups
+- Experience failures when using other features of SQL Server enabled by Azure Arc
+
 ## Related content
 
 - [Troubleshoot Azure extension for SQL Server deployment](troubleshoot-deployment.md)