optional string operator = 2;

  // An array of string values. If the operator is In or NotIn,
  // the values array must be non-empty. If the operator is Exists or DoesNotExist,
  // the values array must be empty. If the operator is Gt or Lt, the values
  // array must have a single element, which will be interpreted as an integer.
  // This array is replaced during a strategic merge patch.
  // +optional