clarifying preview stage

Author: SummerSmith

AKS-Arc/aks-edge-howto-scale-out.md

@@ -14,6 +14,10 @@ Now that AKS Edge Essentials is installed on your primary machine, this article
 
 > [!CAUTION]
 > Scaling to additional nodes is an experimental feature.
+>
+> > [!IMPORTANT]
+> Multi-machine deployment for AKS Edge Essentials is currently in PREVIEW. Previews are provided "as is" and "as available," and they're excluded from the service-level agreements and limited warranty. Azure Kubernetes Service Edge Essentials previews are partially covered by customer support on a best-effort basis.
+
 
 ## Prerequisites