[collectd] PATCH: add support for percentage computation to collectd-nagios

[Fabian Linzberger]

hi,

i am using collectd-nagios to check disk usage via nagios. doing this
you generally like to know when there is less than a certain
percentage of free space on a filesystem, not less than a certain
number of bytes.

the attached patch allows to compute the percentage of the second
checked value against the sum of the first and the second.

this way collectd-nagios can be used like this:

  sudo collectd-nagios -s /var/run/collectd-unixsock -H localhost -n df/df-root
-d used -d free -g percentage -w 20: -c 10:
    
which will warn if there is less than 20% free space on the root
filesystem of the host called localhost.


please give it your consideration,

  fabian
-- 
fabian linzberger -- http://lefant.net/ -- http://debienna.at/
       - do yourself a favour: use and support free software!
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