sdk/log: Add event name to Record

sdk/log/logger.go

@@ -73,6 +73,8 @@ func (l *logger) newRecord(ctx context.Context, r log.Record) Record {
 	sc := trace.SpanContextFromContext(ctx)
 
 	newRecord := Record{
+		eventName: r.EventName(),
+
 		timestamp:         r.Timestamp(),
 		observedTimestamp: r.ObservedTimestamp(),
 		severity:          r.Severity(),

sdk/log/logger_test.go

@@ -33,6 +33,7 @@ func TestLoggerEmit(t *testing.T) {
 	p2WithError.Err = errors.New("error")
 
 	r := log.Record{}
+	r.SetEventName("testing.name")
 	r.SetTimestamp(time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC))
 	r.SetBody(log.StringValue("testing body value"))
 	r.SetSeverity(log.SeverityInfo)
@@ -78,6 +79,7 @@ func TestLoggerEmit(t *testing.T) {
 			record: r,
 			expectedRecords: []Record{
 				{
+					eventName:                 r.EventName(),
 					timestamp:                 r.Timestamp(),
 					body:                      r.Body(),
 					severity:                  r.Severity(),
@@ -118,6 +120,7 @@ func TestLoggerEmit(t *testing.T) {
 			record: r,
 			expectedRecords: []Record{
 				{
+					eventName:                 r.EventName(),
 					timestamp:                 r.Timestamp(),
 					body:                      r.Body(),
 					severity:                  r.Severity(),
@@ -151,6 +154,7 @@ func TestLoggerEmit(t *testing.T) {
 			record: r,
 			expectedRecords: []Record{
 				{
+					eventName:                 r.EventName(),
 					timestamp:                 r.Timestamp(),
 					body:                      r.Body(),
 					severity:                  r.Severity(),
@@ -181,6 +185,7 @@ func TestLoggerEmit(t *testing.T) {
 			record: rWithNoObservedTimestamp,
 			expectedRecords: []Record{
 				{
+					eventName:                 rWithNoObservedTimestamp.EventName(),
 					timestamp:                 rWithNoObservedTimestamp.Timestamp(),
 					body:                      rWithNoObservedTimestamp.Body(),
 					severity:                  rWithNoObservedTimestamp.Severity(),

sdk/log/record.go

@@ -41,7 +41,7 @@ func putIndex(index map[string]int) {
 	indexPool.Put(index)
 }
 
-// Record is a log record emitted by the Logger.
+// Record is a log record or event emitted by the Logger.
 //
 // Do not create instances of Record on your own in production code.
 // You can use [go.opentelemetry.io/otel/sdk/log/logtest.RecordFactory]
@@ -50,6 +50,8 @@ type Record struct {
 	// Do not embed the log.Record. Attributes need to be overwrite-able and
 	// deep-copying needs to be possible.
 
+	eventName string
+
 	timestamp         time.Time
 	observedTimestamp time.Time
 	severity          log.Severity
@@ -104,6 +106,18 @@ func (r *Record) setDropped(n int) {
 	r.dropped = n
 }
 
+// Event returns the event name.
+// A record with non-empty event name is an OpenTelemetry Event.
+// A record with empty event name is an OpenTelemetry Log Record.
+func (r *Record) EventName() string {
+	return r.eventName
+}
+
+// SetEventName sets the event name.
+func (r *Record) SetEventName(s string) {
+	r.eventName = s
+}
+
 // Timestamp returns the time when the log record occurred.
 func (r *Record) Timestamp() time.Time {
 	return r.timestamp