if you want graph of uptime, create new "Probe" with uptime snmp oid("iso.org.dod.internet.mgmt.mib-2.system.sysUpTime.sysUpTimeInstance")
if you want "time ticks" on device "Face" on your map, edit map properties, and add to Device->Label [oid("iso.org.dod.internet.mgmt.mib-2.system.sysUpTime.sysUpTimeInstance")]
if you want graph of uptime, create new "Probe" with uptime snmp oid("iso.org.dod.internet.mgmt.mib-2.system.sysUpTime.sysUpTimeInstance")
if you want "time ticks" on device "Face" on your map, edit map properties, and add to Device->Label [oid("iso.org.dod.internet.mgmt.mib-2.system.sysUpTime.sysUpTimeInstance")]