From Observium

TCP-MIB::tcpRtoAlgorithm.0 = INTEGER: other(1)
TCP-MIB::tcpRtoMin.0 = INTEGER: 200 milliseconds
TCP-MIB::tcpRtoMax.0 = INTEGER: 120000 milliseconds
TCP-MIB::tcpMaxConn.0 = INTEGER: -1
TCP-MIB::tcpActiveOpens.0 = Counter32: 908435
TCP-MIB::tcpPassiveOpens.0 = Counter32: 2652122
TCP-MIB::tcpAttemptFails.0 = Counter32: 13188
TCP-MIB::tcpEstabResets.0 = Counter32: 501556
TCP-MIB::tcpCurrEstab.0 = Gauge32: 23
TCP-MIB::tcpInSegs.0 = Counter32: 728491782
TCP-MIB::tcpOutSegs.0 = Counter32: 310461683
TCP-MIB::tcpRetransSegs.0 = Counter32: 1176396
TCP-MIB::tcpInErrs.0 = Counter32: 824
TCP-MIB::tcpOutRsts.0 = Counter32: 564128