What role does the EventBus play?

Why this is the answer

The EventBus acts as the transport layer of Argo Events by connecting the EventSources and Sensors: EventSources publish the events while the Sensors subscribe to them to execute triggers. Filtering is a Sensor concern and happens after delivery. Creating the workload is the Trigger. And inbound webhooks are terminated by the EventSource's own listener, before anything reaches the bus.