As there exists https://github.com/glensc/nagios-plugin-check_raid I don`t believe we will integrate that.
We removed the contrib/ directory with the 1.5 release. The documentation as also some bits about that at https://www.monitoring-plugins.org/doc/guidelines.html#CONTRIBUTEDPLUGINS -- Reply to this email on GitHub: https://github.com/monitoring-plugins/monitoring-plugins/pull/1351#issuecomment-140733628
