code: func (s *SelectionPredicate) MatchesObjectAttributes(l labels.Set, f fields.Set) bool {
  	if s.Label.Empty() && s.Field.Empty() {
  		return true
  	}
  	matched := s.Label.Matches(l)
  	if matched && s.Field != nil {
  		matched = (matched && s.Field.Matches(f))
  	}
  	return matched
  }
docs: // MatchesObjectAttributes returns true if the given labels and fields
  // match s.Label and s.Field.