// whose value of the label with key topologyKey matches that of any node on which any of the
  // selected pods is running.
  // Empty topologyKey is not allowed.
  optional string topologyKey = 3;

  // A label query over the set of namespaces that the term applies to.
  // The term is applied to the union of the namespaces selected by this field
  // and the ones listed in the namespaces field.