[OTLP] include status code in failure log (#6154)

Author: Timothy Mothra

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExportClient/OtlpGrpcExportClient.cs

@@ -93,7 +93,7 @@ public override ExportClientResponse SendExportRequest(byte[] buffer, int conten
                 grpcStatusDetailsHeader = GrpcProtocolHelpers.GetHeaderValue(trailingHeaders, GrpcStatusDetailsHeader);
             }
 
-            OpenTelemetryProtocolExporterEventSource.Log.ExportFailure(this.Endpoint.ToString(), "Export failed due to unexpected status code.");
+            OpenTelemetryProtocolExporterEventSource.Log.ExportFailure(this.Endpoint, "Export failed due to unexpected status code.", status);
 
             return new ExportClientGrpcResponse(
                 success: false,

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OpenTelemetryProtocolExporterEventSource.cs

@@ -3,6 +3,7 @@
 
 using System.Diagnostics.Tracing;
 using Microsoft.Extensions.Configuration;
+using OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ExportClient.Grpc;
 using OpenTelemetry.Internal;
 
 namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation;
@@ -94,6 +95,15 @@ public void GrpcRetryDelayParsingFailed(string? grpcStatusDetailsHeader, Excepti
         }
     }
 
+    [NonEvent]
+    public void ExportFailure(Uri endpoint, string message, Status status)
+    {
+        if (Log.IsEnabled(EventLevel.Error, EventKeywords.All))
+        {
+            this.ExportFailure(endpoint.ToString(), message, status.ToString());
+        }
+    }
+
     [Event(2, Message = "Exporter failed send data to collector to {0} endpoint. Data will not be sent. Exception: {1}", Level = EventLevel.Error)]
     public void FailedToReachCollector(string rawCollectorUri, string ex)
     {
@@ -208,10 +218,10 @@ public void GrpcStatusWarning(string endpoint, string statusCode)
         this.WriteEvent(22, endpoint, statusCode);
     }
 
-    [Event(23, Message = "Export failed for {0}. Message: {1}", Level = EventLevel.Error)]
-    public void ExportFailure(string endpoint, string message)
+    [Event(23, Message = "Export failed for {0}. Message: {1}. {2}.", Level = EventLevel.Error)]
+    public void ExportFailure(string endpoint, string message, string statusString)
     {
-        this.WriteEvent(23, endpoint, message);
+        this.WriteEvent(23, endpoint, message, statusString);
     }
 
     [Event(24, Message = "Failed to parse gRPC retry delay from header grpcStatusDetailsHeader: '{0}'. Exception: {1}", Level = EventLevel.Warning)]