--- service: b.root-servers.net start-period: 2016-06-12T00:00:00Z end-period: 2016-06-12T23:59:59Z metric: rcode-volume rcodes: 0: 898636726 1: 1277865 14: 6 3: 1778166051 4: 2008 5: 1373861 9: 21804