Update shared-image-galleries.md

adding an additional FAQ

Author: sandeepraichura

articles/virtual-machines/shared-image-galleries.md

@@ -212,6 +212,7 @@ You can create Azure Compute Gallery resource using templates. There are several
 * [What API version should I use to create a VM or Virtual Machine Scale Set out of the image version?](#what-api-version-should-i-use-to-create-a-vm-or-virtual-machine-scale-set-out-of-the-image-version)
 * [Can I update my Virtual Machine Scale Set created using managed image to use Azure Compute Gallery images?](#can-i-update-my-virtual-machine-scale-set-created-using-managed-image-to-use-azure-compute-gallery-images)
 * [How can I update my code to use the new property and ensure permissions are granted accurately during VM image creation?](#how-can-i-update-my-code-to-use-the-new-property-and-ensure-permissions-are-granted-accurately-during-vm-image-creation)
+* [Does deleting the Azure Compute Gallery images affect existing VMs created from it?](#does-deleting-the-azure-compute-gallery-affect-vms-created-from-it)
 
 ### How can I list all the Azure Compute Gallery resources across subscriptions?
 
@@ -368,6 +369,10 @@ StorageProfile = new GalleryImageVersionStorageProfile()
                 }
             },
 ```
+
+### Does deleting the Azure Compute Gallery Image affect existing VM created from it?
+VMs created from the Azure Compute Gallery image remains unaffected due to their persistent disks. However, VMSS scale out operation will fail as they rely on the source image ID reference which would be lost once the Azure Compute Gallery image is deleted.
+
 ## Troubleshoot
 If you have issues with performing any operations on the gallery resources, consult the list of common errors in the [troubleshooting guide](troubleshooting-shared-images.md).