nit

src/Microsoft.ApplicationInsights.AspNetCore/Logging/Implementation/ApplicationInsightsLoggerCallbacks.cs

@@ -1,9 +1,7 @@
-using System;
-using System.Collections.Generic;
-
-namespace Microsoft.ApplicationInsights.AspNetCore.Logging
+namespace Microsoft.ApplicationInsights.AspNetCore.Logging
 {
-    using Microsoft.Extensions.Logging;
+    using System;
+    using System.Collections.Generic;
 
     /// <summary>
     /// Class to control default debug logger and disable it if logger was added to <see cref="ILoggerFactory"/> explicetely.

src/Microsoft.ApplicationInsights.AspNetCore/Logging/Implementation/ApplicationInsightsLoggerFactoryExtensions.cs

@@ -35,7 +35,7 @@ public static ILoggerFactory AddApplicationInsights(
             IServiceProvider serviceProvider,
             LogLevel minLevel)
         {
-            factory.AddApplicationInsights(serviceProvider, (category, logLevel) => logLevel >= minLevel, () => { });
+            factory.AddApplicationInsights(serviceProvider, (category, logLevel) => logLevel >= minLevel);
             return factory;
         }