Flink's Kafka source supports subscription patterns, where it will consume all topics that match a specified regex and periodically monitor for new topics. We should support this in the statefun Kafka ingress as it is generally useful and would remove a source of cluster downtime (subscribing to a new topic).
I propose something like this.
The Flink consumer can be configured with both a list of concrete topics + a pattern so validation is simple.
cc Igal Shilman