kubeClient, err := ctx.CLIClientWithRevision(opts.Revision)
			if err != nil {
				return err
			}

			wg := &clientv1alpha3.WorkloadGroup{}
			if filename != "" {
				if err := readWorkloadGroup(filename, wg); err != nil {
					return err
				}
			} else {
				wg, err = kubeClient.Istio().NetworkingV1alpha3().WorkloadGroups(namespace).Get(context.Background(), name, metav1.GetOptions{})