func GetWebhookTagName(wh admitv1.MutatingWebhookConfiguration) string {
	return wh.ObjectMeta.Labels[label.IoIstioTag.Name]
}

// GetWebhookRevision extracts tag target revision from webhook object.
func GetWebhookRevision(wh admitv1.MutatingWebhookConfiguration) (string, error) {
	if tagName, ok := wh.ObjectMeta.Labels[label.IoIstioRev.Name]; ok {
		return tagName, nil
	}

func tagWebhookConfigFromCanonicalWebhook(wh admitv1.MutatingWebhookConfiguration, tagName, istioNS string) (*tagWebhookConfig, error) {
	rev, err := GetWebhookRevision(wh)
	if err != nil {
		return nil, err
	}
	// if the revision is "default", render templates with an empty revision
	if rev == DefaultRevisionName {
		rev = ""
	}