Today we are using the message event id as the topic name for Kafka/Knative integration. This would work outside of the box since the channel and topic names are the same by default. But an user can change the topic name any time:

https://quarkus.io/guides/kafka#configuring-the-kafka-connector

Plus with KOGITO-3408, we need to review KOGITO-3549 any way since now we will only have ONE topic, despite the number of message events in a BPMN/SW process