fix error output

pkg/webhooks/pod_admission_webhook.go

@@ -54,7 +54,7 @@ func (p *podWebhook) ValidateCreate(ctx context.Context, obj runtime.Object) (ad
 		return nil, fmt.Errorf("follower pod node selector not set")
 	}
 	if _, exists := pod.Spec.NodeSelector[topologyKey]; !exists {
-		return nil, fmt.Errorf("follower pod node selector not set")
+		return nil, fmt.Errorf("follower pod node selector for topology domain not found. missing selector: %s", topologyKey)
 	}
 	// For follower pods, validate leader pod exists and is scheduled.
 	leaderScheduled, err := p.leaderPodScheduled(ctx, pod)

pkg/webhooks/pod_mutating_webhook.go

@@ -188,7 +188,7 @@ func (p *podWebhook) topologyFromPod(ctx context.Context, pod *corev1.Pod, topol
 	// Get topology (e.g. node pool name) from node labels.
 	topology, exists := node.Labels[topologyKey]
 	if !exists {
-		return "", fmt.Errorf("node does not have topology label: %s", topology)
+		return "", fmt.Errorf("node does not have topology label: %s", topologyKey)
 	}
 	return topology, nil
 }