if image != "" {
			retval[configMap.ObjectMeta.GetLabels()[label.IoIstioRev.Name]] = image
		}
	}

	return retval, nil
}

// podCountByRevision() returns a map of revision->pods, with "<non-Istio>" as the dummy "revision" for uninjected pods
func podCountByRevision(pods []corev1.Pod, expectedRevision string) map[string]revisionCount {
	retval := map[string]revisionCount{}
	for _, pod := range pods {