[Observium] Some metrics on some devices momentarily reporting as 0 causing many ALERT/RECOVER emails

Hi there,

I have an alert set up to trigger if a storage device's used space is 80% or more.

We have a few devices which are over this threshold, but they sometimes momentarily report their storage_perc as 0, triggering a RECOVER email and then an ALERT email as soon as the device starts reporting its storage_perc correctly again.

I know that this isn't necessarily an issue with Observium, but is there anything I can do to ignore a value of 0?

Many thanks

Olly