is it possible to get notification only if the value changes by a %?
It would be helpful for disks because if there is a spike there could be a problem, or more on disk iops, meaning that there may be a cryptolocker in action.
some items store pevious values, others do not.
But on libreNMS there is the item history, so a comparison could be done
You can’t alert on graph values in LibreNMS currently. You are welcome to write some code to add support for that