This graph shows the total number of open files of a specific
Unix program. This can be helpful to determine if there is a
suspicious resource-hog process. The data for it is returned
by the nagios plugin check_unix_open_fds.pl.
The plugin is available here:

http://www.tcomm.es/joomla/index.php/en/downloads-menu/view.download/19-unix/10-checkunixopenfds.html

author: TComm - Carlos Peris Pla