[Observium] Alerts on Aggregate values or sums?

Bit of an RFE here, would like to be able to alert on the aggregate value for a group, or do sums in the alert checker test field, unless I’m just missing how to do this?

My particular use check is adding up the total power for a 3 phase PDU (and a group for the power panel), and alerting if the total watts or amps are greater than 80% of the circuit capacity. Total Power Output on my APC 3 phase PDUs doesn’t work for me here because it’s dependent on the power factor of the connected devices, and that isn’t readily available in observium. Even if it was, I’d still need math (division this time) on two values. Sums/aggregates seem like the easiest route for this task.

Thanks,

-Darrell