Alerting on a Percentage of Threshold of a group being down

[Nick]

Hi,

Was wondering if there is a way with nagios to report on a percentage or 
below a threshold of group being unavailable?

For example if i have a 100 web servers but i only want to know if more 
than 30% of them are unreachable or if more than 30 of them are unreachable.

-- N

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