[Exporter.Geneva] Add logging for successful exports (open-telemetry#1805)

Co-authored-by: Cijo Thomas <[email protected]>
Co-authored-by: Cijo Thomas <[email protected]>

Author: vishweshbankwar

src/OpenTelemetry.Exporter.Geneva/Internal/ExporterEventSource.cs

@@ -16,6 +16,7 @@ internal sealed class ExporterEventSource : EventSource
     private const int EVENT_ID_METRIC = 3; // Failed to send Metric
     private const int EVENT_ID_ERROR = 4; // Other common exporter exceptions
     private const int EVENT_ID_OTLP_PROTOBUF_METRIC = 5; // Failed to serialize metric
+    private const int EVENT_ID_COMPLETED_EXPORT = 6; // Completed export
 
     [NonEvent]
     public void FailedToSendTraceData(Exception ex)
@@ -103,4 +104,10 @@ public void FailedToSerializeMetric(string metricName, string error)
     {
         this.WriteEvent(EVENT_ID_OTLP_PROTOBUF_METRIC, metricName, error);
     }
+
+    [Event(EVENT_ID_COMPLETED_EXPORT, Message = "'{0}' completed data export.", Level = EventLevel.Informational)]
+    public void ExportCompleted(string exporterName)
+    {
+        this.WriteEvent(EVENT_ID_COMPLETED_EXPORT, exporterName);
+    }
 }

src/OpenTelemetry.Exporter.Geneva/MsgPackExporter/MsgPackLogExporter.cs

@@ -133,6 +133,8 @@ public ExportResult Export(in Batch<LogRecord> batch)
             }
         }
 
+        ExporterEventSource.Log.ExportCompleted(nameof(MsgPackLogExporter));
+
         return result;
     }
 

src/OpenTelemetry.Exporter.Geneva/MsgPackExporter/MsgPackTraceExporter.cs

@@ -166,6 +166,8 @@ public ExportResult Export(in Batch<Activity> batch)
             }
         }
 
+        ExporterEventSource.Log.ExportCompleted(nameof(MsgPackTraceExporter));
+
         return result;
     }