This read-write setting, DURABLE across reboots, chooses what action, filter, backpressure, or filter-broadcast, is taken on the monitored bus once its configured threshold is exceeded. An admin selects the action appropriate to the kind of overload being mitigated, such as filtering broadcast traffic specifically versus applying general backpressure. For example, choosing filter-broadcast(3) targets broadcast storms specifically rather than throttling all traffic types on that bus.