feat: add event recorder event

Signed-off-by: googs1025 <googs1025@gmail.com>

pkg/constants/constants.go

@@ -48,6 +48,10 @@ const (
 	// The event uses the error(s) as the reason.
 	JobCreationFailedReason = "JobCreationFailed"
 
+	// Event reason used when a Headless Service creation fails.
+	// The event uses the error(s) as the reason.
+	HeadlessServiceCreationFailedReason = "HeadlessServiceCreationFailed"
+
 	// Event reason and message for when the pod controller detects a violation
 	// of the JobSet exclusive placment policy (i.e., follower pods not colocated in
 	// the same topology domain as the leader pod for that Job).

pkg/controllers/jobset_controller.go

@@ -576,6 +576,7 @@ func (r *JobSetReconciler) createHeadlessSvcIfNecessary(ctx context.Context, js
 
 		// Create headless service.
 		if err := r.Create(ctx, &headlessSvc); err != nil {
+			r.Record.Eventf(js, corev1.EventTypeWarning, constants.HeadlessServiceCreationFailedReason, err.Error())
 			return err
 		}
 		log.V(2).Info("successfully created headless service", "service", klog.KObj(&headlessSvc))