Clarify logging behaviour in troubleshooting doc

docs/troubleshooting.asciidoc

@@ -39,9 +39,29 @@ The way to collect logs depends on the setup of your application.
 ==== ASP.NET Core
 
 If you added the agent to your application as per the <<setup-asp-net-core>> document with the `UseAllElasticApm` or `UseElasticApm` method, it will integrate with the
-https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging/?view=aspnetcore-3.1[ASP.NET Core logging infrastructure].
+https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging[ASP.NET Core logging infrastructure].
 This means the Agent will pick up the configured logging provider and log as any other component logs.
 
+[IMPORTANT]
+--
+In this scenario, the `LogLevel` APM agent configuration (e.g. setting the `ELASTIC_APM_LOG_LEVEL` environment variable) DOES NOT control the 
+verbosity of the agent logs. The agent logs are controlled by the ASP.NET Core logging configuration from `IConfiguration`, typically configured 
+via `appsettings.json`.
+--
+
+For example, the following configuration in `appsettings.json` limits APM agents logs to those with a log level of `Warning` or higher:
+
+[source,xml]
+----
+"Logging": {
+  "LogLevel": {
+    "Default": "Information",
+    "Elastic.Apm": "Warning" <1>
+  }
+},
+----
+<1> Control the verbosity of the agent logs by setting the log level for the `Elastic.Apm` category
+
 [float]
 [[collect-logs-classic]]
 ==== ASP.NET Classic