[Observium] Delay the alert trigger in case of loss only one ping

Hi everyone , Observium lost 1 ping sometime (I don't know why ) after each ping lost, alerts are triggered.

Actually I have only two Alerts Checks :

Device Down device_status equals 0 * * Device UP device_status equals 1 * *

It's possible to add a delay before triggering ? Like waiting 5 ping lost before triggering ?

Regards.

Pierrick Prost