Services are grouped together as a set of one or more services to which events can be sent. One of the services in a service group can be tagged as the source of events for all event types associated with this service group.

Each Event Routing runtime contains a default service group, which is sufficient for most use cases. However, you can also define a custom service group for a particular runtime.

For every custom service group you must define the following:

At runtime, each event emitted by an application is delivered to one or more services based on its event type. If an event type is associated with a custom service group, the event of this event type is routed to the services within that particular service group. When an application emits events of an event type not associated with any custom service group, these events are routed to the services defined within the default service group.

For more information about configuring service groups, see Configuring Custom Service Groups.