fix: Support OTLP event_name field in logs exporter

exporter/collector/logs.go

@@ -518,6 +518,14 @@ func (l logMapper) logToSplitEntries(
 		}
 	}
 
+	// Add OTLP event_name field as "event.name" label
+	if eventName := logRecord.EventName(); eventName != "" {
+		if entry.Labels == nil {
+			entry.Labels = make(map[string]string)
+		}
+		entry.Labels["event.name"] = eventName
+	}
+
 	// Handle map and bytes as JSON-structured logs if they are successfully converted.
 	switch logRecord.Body().Type() {
 	case pcommon.ValueTypeMap:

exporter/collector/logs_test.go

@@ -890,6 +890,45 @@ func TestLogMapping(t *testing.T) {
 			},
 			maxEntrySize: defaultMaxEntrySize,
 		},
+		{
+			name: "log with event_name",
+			mr: func() *monitoredrespb.MonitoredResource {
+				return nil
+			},
+			log: func() plog.LogRecord {
+				log := plog.NewLogRecord()
+				log.SetEventName("my.event")
+				return log
+			},
+			expectedEntries: []*logpb.LogEntry{
+				{
+					LogName:   logName,
+					Timestamp: timestamppb.New(testObservedTime),
+					Labels: map[string]string{
+						"event.name": "my.event",
+					},
+				},
+			},
+			maxEntrySize: defaultMaxEntrySize,
+		},
+		{
+			name: "log with empty event_name",
+			mr: func() *monitoredrespb.MonitoredResource {
+				return nil
+			},
+			log: func() plog.LogRecord {
+				log := plog.NewLogRecord()
+				// event_name is empty by default
+				return log
+			},
+			expectedEntries: []*logpb.LogEntry{
+				{
+					LogName:   logName,
+					Timestamp: timestamppb.New(testObservedTime),
+				},
+			},
+			maxEntrySize: defaultMaxEntrySize,
+		},
 	}
 
 	for _, testCase := range testCases {