--- service: a.root-servers.net start-period: '2014-07-31T00:00:00Z' end-period: '2014-07-31T23:59:59Z' metric: rcode-volume 0: 914715476 1: 227776 2: 1136 3: 946371839 4: 7301 5: 900041 6: 1438 7: 534 8: 1561 9: 2321 10: 2237 11: 1570 12: 1208 13: 1088 14: 764 15: 1106 16: 3