Nagios Support Forum

Hi All,

I'm looking for a plugin/script that would take a reading (say signal level) and then alert on a % change.

For example:

First poll signal level is 50. IF the signal level moves +/- 10% at anytime, alert.

I've searched around and really can't find anything. From what i gather, the script would need to store that original value in some kind of temp file and then run checks against it.

Thanks in advance for any suggestions.

Nagios Core by itself isn't really built for the monitoring of time-series data. Nagios XI keeps a time-series for every check that it is capable of keeping a time-series for.

As far as open source solutions go, pnp4nagios exists to keep a time-series of performance data per Nagios object in RRDs, which can then be referenced by a plugin like check_rrd.

You can also export perfdata to something like InfluxDB with Nagflux and use a plugin like this one to "check" it:
https://github.com/locationlabs/influxdb-nagios-plugin

I agree with @mcapra. It seems like you'd need to build a custom plugin for this. If you know a particular model of the device you're looking to monitor try looking it up on the Exchange portal: https://exchange.nagios.org. We might have some specific plugins made for your device.