All events should be prefixed with $service-name.$host-name.

• Emit received events as event.$event-name
• Emit invalid events as invalid.$event-name
• Emit failed actions as $action.failure.$event-name
• Emit successful actions as $action.success.$event-name
• Emit stop signals as stop.$signal
• Emit reloads as reload

In any case, use '_unknown' for $event-name if necessary