If we want to migrate JobQueue to the EventBus we'd post all the jobs into Kafka as events. Job parameters could be quite large, so storing the job-related events is not only unnecessary, but really wasteful. Kafka support setting per-topic log.retention.hours, so for job-related topic this should be decreased to 1 day or something. Since job-related topics would be auto created we need to somehow specify that int he topics config.
The job-related topic names should be wild carded so that the retention applies to all the job-related topics. See T157091 for more details.