Registering event sources

An event source is a service or application on IBM Cloud that emits event notifications and publishes them to a topic within the Event Notifications service. A source is a registered entity in an Event Notifications service instance. A source can be registered to an Event Notifications service instance either as an IBM Cloud source, an API source, or an IBM Cloud platform source.

A source can publish to multiple topics. In other contexts, sources are identified as producers or publishers.

From a billing perspective, ingested notifications are calculated for all incoming events. If you disable a source or if the source is not connected to a topic, you are not billed for the events from the IBM Cloud source. However, if the source is Enabled, and a topic is connected to it, the ingested events include all incoming events (not only the events that are filtered in the topic).