A way to alert suspicous trends?

[Jelle Smet]

Hi List, 

Using the disk check we can see the usage and set thresholds.
The performance info is stored into a RRD and viewed through pnp. 

This all works as expected. 

Now that the RRD contains historical data, I was wondering if there are
any checks or systems available which can detect and and alert on
suspicious trends. 

For example in the case of a disk check.
If the disk usage increased with 50% over the last 15 minutes, that
indicates a problem... while this doesn't necessarely mean a threshold is
exceeded.
Or if the disk usage is growing steady, we will run out of space in 2
days, ... but the coninuous gentle growth indicates a problem (log file
appends for example) 

Thanks for the info.

Jelle Smet
http://www.smetj.net
 
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