// A label selector is a label query over a set of resources. The result of matchLabels and
// matchExpressions are ANDed. An empty label selector matches all objects. A null
// label selector matches no objects.
// +structType=atomic
message LabelSelector {
  // matchLabels is a map of {key,value} pairs. A single {key,value} in the matchLabels
  // map is equivalent to an element of matchExpressions, whose key field is "key", the