add 'gradually rolling out to tenants' disclaimer for livestream

Author: cabailey

articles/sentinel/livestream.md

@@ -14,14 +14,14 @@ ms.topic: conceptual
 ms.custom: mvc
 ms.tgt_pltfrm: na
 ms.workload: na
-ms.date: 11/04/2019
+ms.date: 11/26/2019
 ms.author: cabailey
 ---
 
 # Use hunting Livestream in Azure Sentinel to detect threats
 
 > [!IMPORTANT]
-> Hunting Livestream in Azure Sentinel is currently in public preview.
+> Hunting Livestream in Azure Sentinel is currently in public preview and gradually rolling out to tenants.
 > This feature is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities. 
 > For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).