[Observium] High CPU alarm

Hi

I have a synology nas with 1CPU and 4 cores in it. Whenever 1 core gets a shitload to do I get a CPU high alarm although it's not the combined cpu load that is high.

Is there something I can do in the alarm checker to combine the cpu loads of all cores and trigger an alarm when all 4 combined is over for example 80% load?

Regards Daniel