Select a Hirschmann MMP4 industrial Ethernet switch as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type hmAgentSSHSessionsCount into the Find box to locate it in the OID tree, then select it and click OK. It reports the current number of active SSH sessions on this switch. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if the count exceeds the number of concurrent administrators you expect to be logged in, since an unusually high session count could indicate unauthorized access. Click Finish to create the monitor; you can adjust any parameter later.