Merge pull request #47425 from xiaomi7732/patch-4

Update profiler-troubleshooting.md

Author: ktoliver

articles/azure-monitor/app/profiler-troubleshooting.md

@@ -13,6 +13,11 @@ ms.reviewer: mbullwin
 
 # Troubleshoot problems enabling or viewing Application Insights Profiler
 
+## Active issues
+
+* Profiling for ASP.NET Core 3.x applications isn't supported yet.
+  * If you must have Profiler on, a workaround is to use [Application Insights Profiler for ASP.NET Core](https://github.com/microsoft/ApplicationInsights-Profiler-AspNetCore). The profiler is labeled for Linux, but it also works with .NET Core 3.0+ applications on Windows. For details, see [Supported versions](https://github.com/microsoft/ApplicationInsights-Profiler-AspNetCore#supported-versions).
+
 ## <a id="troubleshooting"></a>General troubleshooting
 
 ### Profiles are uploaded only if there are requests to your application while Profiler is running