fix: adapt to event field refactor and log marshal errors

  Update span attribute references from l.event to local event variable
  after upstream refactored shared event field to per-request scope
  (0faad24). Log json.Marshal errors for span context carrier.

  Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ci-operator

pkg/adapter/adapter.go

@@ -205,14 +205,14 @@ func (l listener) handleEvent(ctx context.Context) http.HandlerFunc {
 		)
 
 		span.SetAttributes(
-			tracing.VCSEventTypeKey.String(l.event.EventType),
+			tracing.VCSEventTypeKey.String(event.EventType),
 			tracing.VCSProviderKey.String(gitProvider.GetConfig().Name),
 		)
-		if l.event.URL != "" {
-			span.SetAttributes(tracing.VCSRepositoryKey.String(l.event.URL))
+		if event.URL != "" {
+			span.SetAttributes(tracing.VCSRepositoryKey.String(event.URL))
 		}
-		if l.event.SHA != "" {
-			span.SetAttributes(tracing.VCSRevisionKey.String(l.event.SHA))
+		if event.SHA != "" {
+			span.SetAttributes(tracing.VCSRevisionKey.String(event.SHA))
 		}
 
 		s := sinker{

pkg/kubeinteraction/labels.go

@@ -70,7 +70,9 @@ func AddLabelsAndAnnotations(ctx context.Context, event *info.Event, pipelineRun
 
 	// Add span context for distributed tracing if available
 	if len(carrier) > 0 {
-		if jsonBytes, err := json.Marshal(carrier); err == nil {
+		if jsonBytes, err := json.Marshal(carrier); err != nil {
+			logging.FromContext(ctx).Errorf("failed to marshal span context carrier: %v", err)
+		} else {
 			if existing := pipelineRun.GetAnnotations()[keys.SpanContextAnnotation]; existing != "" {
 				logging.FromContext(ctx).Warnf("overwriting pre-existing %s annotation on PipelineRun template; honoring initiating event trace context", keys.SpanContextAnnotation)
 			}