code: public static Filter<ResourceRecordSet<?>> alwaysVisible() {
      return new Filter<ResourceRecordSet<?>>() {
  
        @Override
        public boolean apply(ResourceRecordSet<?> in) {
          return in != null && in.qualifier() == null;
        }
  
        @Override
        public String toString() {
          return "alwaysVisible()";
        }
      };
    }
docs: Returns true if the input has no visibility qualifier. Typically indicates a basic record set.