add preview tag

Author: duongau

articles/expressroute/how-to-configure-traffic-collector.md

@@ -1,5 +1,5 @@
 ---
-title: Configure Traffic Collector for ExpressRoute Direct
+title: Configure Traffic Collector for ExpressRoute Direct (Preview)
 titleSuffix: Azure ExpressRoute
 description: This article shows you how to create an ExpressRoute Traffic Collector resource and import logs into a Log Analytics workspace.
 services: expressroute
@@ -11,7 +11,7 @@ ms.author: duau
 #Customer intent: As a network engineer, I want to configure ExpressRoute Traffic Collector to import flow logs into a Log Analytics workspace.
 ---
 
-# Configure Traffic Collector for ExpressRoute Direct
+# Configure Traffic Collector for ExpressRoute Direct (Preview)
 
 This article helps you deploy an ExpressRoute Traffic Collector using the Azure portal. You learn how to add and remove an ExpressRoute Traffic Collector, associate it to an ExpressRoute Direct circuit and Log Analytics workspace. Once the ExpressRoute Traffic Collector is deployed, sampled flow logs get imported into a Log Analytics workspace. For more information, see [About ExpressRoute Traffic Collector](traffic-collector.md).
 
@@ -93,4 +93,4 @@ Once all circuits have been removed from the ExpressRoute Traffic Collector, sel
 
 ## Next step
 
-- Learn about [ExpressRoute Traffic Collector metrics](expressroute-monitoring-metrics-alerts.md#expressroute-traffic-collector-metrics) to monitor your ExpressRoute Traffic Collector resource.
+- Learn about [ExpressRoute Traffic Collector metrics](expressroute-monitoring-metrics-alerts.md#expressroute-traffic-collector-metrics) to monitor your ExpressRoute Traffic Collector resource.