check_ucd

This data collection plugin allows you to remotely query a server via a
plugin to the UCD SNMP agent.  It works with Nagios plugins.

On the remote host, you configure the SNMP agent by adding a line to the
snmpd.conf file specifying the remote plugin to run (this can be a Nagios
plugin)

exec pluginname /path/to/plugin parameters

Then you can call check_ucd in MRTG mode with the -M flag:

Target[xxxx]: `check_ucd -M -C community -H hostname -v pluginname`

Provided the plugin returns zero status, the first number in the text output 
will be extracted and used for the output.

