docs: @Nullable
      public static List<String> resolveARecord(String rootDomainName) {
          if (isLocalOrIp(rootDomainName)) {
              return null;
          }
          try {
              Attributes attrs = getDirContext().getAttributes(rootDomainName, new String[]{A_RECORD_TYPE, CNAME_RECORD_TYPE});
              Attribute aRecord = attrs.get(A_RECORD_TYPE);
              Attribute cRecord = attrs.get(CNAME_RECORD_TYPE);
              if (aRecord != null && cRecord == null) {
                  List<String> result = new ArrayList<>();
                  NamingEnumeration<String> entries = (NamingEnumeration<String>) aRecord.getAll();
                  while (entries.hasMore()) {
                      result.add(entries.next());
                  }
                  return result;
              }
          } catch (Exception e) {
              logger.warn("Cannot load A-record for eureka server address {}", rootDomainName, e);
              return null;
          }
          return null;
      }