Select an Allied Telesis x530-28GSX (2024) 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 locate cpuUtilisationMax under the cpu branch of AT-SYSINFO-MIB, then select it and click OK. It reports the highest CPU utilization percentage recorded since the router was last restarted. 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 INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if this peak exceeds 90%, which would indicate the router has come close to CPU exhaustion at some point. Click Finish to create the monitor; you can adjust any parameter later.