--- service: j.root-servers.net start-period: '2016-04-30T00:00:00Z' end-period: '2016-04-30T23:59:59Z' metric: rcode-volume 0: 2160646321 1: 514140 2: 704 3: 3587511899 4: 43899 5: 2000798 6: 12526 7: 457925 8: 282 9: 423 10: 792 11: 349 12: 1603 13: 1684 14: 347 15: 707 16: 8