added specific ApplicationInsightsLoggerOptions to configure logging

CHANGELOG.md

@@ -5,6 +5,7 @@
 - [Make all built-in TelemetryInitializers public to allow easy removal from DI Container.](https://github.com/Microsoft/ApplicationInsights-aspnetcore/issues/351)
 - [Enforced limits of values read from incoming http requests to prevent security vulnerability](https://github.com/Microsoft/ApplicationInsights-aspnetcore/pull/608)
 - [ApplicationInsightsLogger adds EventId into telemetry properties. It is off by default for compatibility. It can be switched on by configuring ApplicationInsightsLoggerOptions.](https://github.com/Microsoft/ApplicationInsights-aspnetcore/issues/569)
+- [ApplicationInsightsLogger logs exceptions as ExceptionTelemetry by default. This can now be configured with ApplicationInsightsLoggerOptions.TrackExceptionsAsExceptionTelemetry] (https://github.com/Microsoft/ApplicationInsights-aspnetcore/pull/574)
 
 ## Version 2.2.1
 - Updated Web/Base SDK version dependency to 2.5.1 which addresses a bug.

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

@@ -50,7 +50,7 @@ public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Except
             if (this.IsEnabled(logLevel))
             {
                 var stateDictionary = state as IReadOnlyList<KeyValuePair<string, object>>;
-                if (exception == null)
+                if (exception == null || this.options?.TrackExceptionsAsExceptionTelemetry == false)
                 {
                     var traceTelemetry = new TraceTelemetry(formatter(state, exception), this.GetSeverityLevel(logLevel));
                     PopulateTelemetry(traceTelemetry, stateDictionary, eventId);

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

@@ -1,13 +1,31 @@
-namespace Microsoft.ApplicationInsights.AspNetCore.Logging
+using Microsoft.ApplicationInsights.DataContracts;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.ApplicationInsights.AspNetCore.Logging
 {
     /// <summary>
-    /// Options for configuration of <see cref="ApplicationInsightsLogger"/>.
+    /// <see cref="ApplicationInsightsLoggerOptions"/> defines the custom behavior of the tracing information sent to Application Insights.
     /// </summary>
     public class ApplicationInsightsLoggerOptions
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ApplicationInsightsLoggerOptions" /> class.
+        /// Application Insights logger options can configure how <see cref="ILogger"/> behaves when sending telemetry.
+        /// </summary>
+        public ApplicationInsightsLoggerOptions()
+        {
+            TrackExceptionsAsExceptionTelemetry = true;
+        }
+
+        /// <summary>
+        /// Gets or sets a value whether to track exceptions as <see cref="ExceptionTelemetry"/>.
+        /// </summary>
+        public bool TrackExceptionsAsExceptionTelemetry
+        { get; set; }
+
         /// <summary>
         /// Gets or sets value indicating, whether EventId and EventName properties should be included in telemetry.
         /// </summary>
         public bool IncludeEventId { get; set; }
     }
-}
+}

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

@@ -22,6 +22,7 @@ public ApplicationInsightsLoggerProvider(TelemetryClient telemetryClient, Func<s
             this.telemetryClient = telemetryClient;
             this.filter = filter;
             this.options = options.Value;
+
         }
 
         /// <inheritdoc />

test/Microsoft.ApplicationInsights.AspNetCore.Tests/Logging/ApplicationInsightsLoggerTests.cs

@@ -386,11 +386,48 @@ public void TestLoggerWithNegativeFilterDoesNotCreateExceptionTelemetryOnLoggedE
 
             ILogger logger = new ApplicationInsightsLogger("test-category", client, (s, l) => { return false; }, defaultOptions);
             var exception = new Exception("This is an error");
+
             logger.LogError(0, exception, "Error: " + exception.Message);
 
             Assert.False(trackedTelemetry);
         }
 
+        [Fact]
+        public void TestLoggerCreatesTraceTelemetryOnLoggedErrorWhenTrackExceptionsAsExceptionTelemetryIsSetToFalse()
+        {
+            TelemetryClient client = CommonMocks.MockTelemetryClient((t) =>
+            {
+                Assert.IsType<TraceTelemetry>(t);
+                var traceTelemetry = (TraceTelemetry)t;
+
+                Assert.Equal("Error: This is an error", traceTelemetry.Message);
+                Assert.Equal(SeverityLevel.Error, traceTelemetry.SeverityLevel);
+            });
+
+            ILogger logger = new ApplicationInsightsLogger("test", client, (s, l) => { return true; }, new ApplicationInsightsLoggerOptions { TrackExceptionsAsExceptionTelemetry = false });
+            var exception = new Exception("This is an error");
+
+            logger.LogError(0, exception, "Error: " + exception.Message);
+        }
+
+        [Fact]
+        public void TestLoggerCreatesExceptionTelemetryOnLoggedErrorWhenTrackExceptionsAsExceptionTelemetryIsSetToTrue()
+        {
+            TelemetryClient client = CommonMocks.MockTelemetryClient((t) =>
+            {
+                Assert.IsType<ExceptionTelemetry>(t);
+                var exceptionTelemetry = (ExceptionTelemetry)t;
+
+                Assert.Equal("Error: This is an error", exceptionTelemetry.Message);
+                Assert.Equal(SeverityLevel.Error, exceptionTelemetry.SeverityLevel);
+            });
+
+            ILogger logger = new ApplicationInsightsLogger("test", client, (s, l) => { return true; }, new ApplicationInsightsLoggerOptions { TrackExceptionsAsExceptionTelemetry = true });
+            var exception = new Exception("This is an error");
+
+            logger.LogError(0, exception, "Error: " + exception.Message);
+        }
+
         /// <summary>
         /// Tests that an incorrectly constructed or uninitialized Application Insights ILogger does not throw exceptions.
         /// </summary>