I have registered in Pivotal Web Services and do not see the Kafka service there. Is it available for a free trial plan ? How to use Kafka message broker with Pivotal Web Services?
At the time of me writing this, there is no Kafka service in the Pivotal Web Services marketplace. You can see the list of services that are publicly available here.
https://docs.run.pivotal.io/marketplace/services/
If you want to use Kafka with your apps, you'd need to bring your own service or use a third party service provider that's outside of the marketplace.