Removing old ikey guidance

Author: AarDavMax

includes/azure-monitor-app-insights-azure-web-apps-troubleshoot.md

@@ -1,16 +1,12 @@
 ---
 ms.topic: include
-ms.date: 09/03/2021
-ms.author: lagayhar
-author: lgayhardt
+ms.date: 08/04/2023
+ms.author: AaronMaxwell
+author: AaronMaxwell
 services: azure-monitor
 ms.subservice: application-insights
 ---
 
-### Connection string and instrumentation key
-
-When codeless monitoring is being used, only the connection string is required. We still recommend that you set the instrumentation key to preserve backward compatibility with older versions of the SDK when manual instrumentation is being performed.
-
 ### What's the difference between standard metrics from Application Insights vs. Azure App Service metrics?
 
 Application Insights collects telemetry for the requests that made it to the application. If the failure occurred in WebApps/WebServer, and the request didn't reach the user application, Application Insights won't have any telemetry about it.