Two Events Transform into One?

Hi,

I am setting traffic thresholds on multiple network Ethernet interfaces to trigger notifications when traffic drops below threshold. The problem is that we have redundant interfaces throughout the core topology, so we only want to know when traffic drops at the same time on redundant interfaces. For instance, I only want to know when traffic on both gw01 and gw02 interfaces Gi0/0 drop, not when routing is changing between them and drops on one or the other.

I am pretty sure this can't be done easily, I believe that event triggers won't work with rules among multiple events. Maybe there is a previous post about this Or an event transform that accomplishes something resembling this Please point me in the right direction! Thanks for your help!

-John