// won't make it *more* imbalanced.
  // It's a required field.
  optional string whenUnsatisfiable = 3;

  // LabelSelector is used to find matching pods.
  // Pods that match this label selector are counted to determine the number of pods
  // in their corresponding topology domain.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector labelSelector = 4;