log to indicated Authentication Policy caught the response from ingestion (#2319)

BASE/src/ServerTelemetryChannel/Implementation/TelemetryChannelEventSource.cs

@@ -565,6 +565,12 @@
             this.WriteEvent(77, exception ?? string.Empty, this.ApplicationName);
         }
 
+        [Event(78, Message = "AuthenticatedTransmissionError. Received a failed ingestion response. TransmissionId: {0}. Status Code: {1}. Status Description: {2}", Level = EventLevel.Warning)]
+        public void AuthenticationPolicyCaughtFailedIngestion(string transmissionId, string statusCode, string statusDescription, string appDomainName = "Incorrect")
+        {
+            this.WriteEvent(78, transmissionId ?? string.Empty, statusCode ?? string.Empty, statusDescription ?? string.Empty, this.ApplicationName);
+        }
+
         private static string GetApplicationName()
         {
             //// We want to add application name to all events BUT

BASE/src/ServerTelemetryChannel/Implementation/TransmissionPolicy/AuthenticationTransmissionPolicy.cs

@@ -1,6 +1,7 @@
 namespace Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.Implementation.TransmissionPolicy
 {
     using System;
+    using System.Globalization;
     using System.Threading.Tasks;
 
     using Microsoft.ApplicationInsights.Channel.Implementation;
@@ -65,6 +66,10 @@
                 {
                     case ResponseStatusCodes.Unauthorized:
                     case ResponseStatusCodes.Forbidden:
+                        TelemetryChannelEventSource.Log.AuthenticationPolicyCaughtFailedIngestion(
+                            transmissionId: e.Transmission.Id, 
+                            statusCode: e.Response.StatusCode.ToString(CultureInfo.InvariantCulture),
+                            statusDescription: e.Response.StatusDescription);
                         this.ApplyThrottlePolicy(e);
                         break;
                 }