This mod adds a circuit entity called an Alerter that works like a decider combinator. When it's condition evaluates to true a configurable alert message will be displayed in the bottom right, in the same way alien attacks are.
When multiple alerts are being broadcast, it seems like the first one is the only one that will be displayed. After the first one is resolved, then another one will take its place. Is it possible to cycle through all the available alerts, or display multiple alerts at the same time?