How to Use the Linux SNMP Wizard in Nagios XI

Nagios XI includes a Linux SNMP wizard that enables you to easily connect to Linux hosts via SNMP v2c/v3 and quickly configure monitoring of disk usage, running processes, and other server metrics with thresholds and alerts.

You can refer to this documentation for full details:

Here is a direct link to the PDF as well:

Monitoring Linux using SNMP in Nagios XI