SNMP, which stands for Simple Network Management Protocol, is protocol that lets you monitor managed network devices. SNMP is currently one of the most poorly documented areas of Munin. But we do have some things:
- Using SNMP plugins
- Writing SNMP plugins
- Concise Guide to plugin authoring briefly explains how snmpconf works in plugins
- HOWTO Monitor Windows - by using SNMP
- Simple Network Management Protocol Explanation
I would also recomend persuing some of the existing snmp plugins, in the distribution these are found in node/node.d and are called snmp__*.