fix diagram

Author: vhorne

articles/application-gateway/application-gateway-metrics.md

@@ -5,7 +5,7 @@ services: application-gateway
 author: azhar2005
 ms.service: application-gateway
 ms.topic: article
-ms.date: 06/06/2020
+ms.date: 04/19/2021
 ms.author: azhussai
 
 ---
@@ -19,7 +19,7 @@ Application Gateway publishes data points, called metrics, to [Azure Monitor](..
 
 Application Gateway provides several built‑in timing metrics related to the request and response, which are all measured in milliseconds. 
 
-![Diagram of timing metrics, for the Application Gateway.](./media/application-gateway-metrics/application-gateway-metrics.jpg)
+:::image type="content" source="./media/application-gateway-metrics/application-gateway-metrics.png" alt-text="[Diagram of timing metrics for the Application Gateway":::
 
 > [!NOTE]
 >