Hello the people of the monitoring plugins project!
I'm a developer at op5 that have worked with Andreas Ericsson on a few new plugins that can check different aspects of a system over SNMP. So far we have written plugins to check disk usage, memory usage, processes and system load average and will probably add more in the future. Is this something that you guys would be interested in adding to the project? If so, I could send you a pull request later on when we are happy with the plugins.