Просто в DCI в разделе Transformation, скрипт работает, но хотел его запихнуть в библиотеку скриптов

// Description format - (Tunnel '37.203.240.35' active time)
transport = CreateSNMPTransport($node);

if (transport == null) return -1;  // if no SNMP

oid = ".1.3.6.1.4.1.9.9.171.1.2.3.1.7"; // where IP addresses search

vars = SNMPWalk(transport, oid);  //SNMP walk over OID

if (vars == null) return -2; // SNMPWalk failed

dcidescription = SplitString($dci->description, "'"); // DCI description to array
ipsec = dcidescription[1]; // get tunnel IP from DCI description

foreach (v: vars) { //look over OID tree
  if(v->value == ipsec) {  //if IPSEC ip found
    instances = SplitString(v->name, ".");  //convert OID to array
    instance = instances[instances->size - 1]; //get last instance from OID
    seconds = SNMPGetValue(transport, ".1.3.6.1.4.1.9.9.171.1.2.3.1.16." . instance);  //get number of seconds that tunnel was active
    return SecondsToUptime(seconds / 100);
  }
}