What can we do to prevent kafka outages?

[He-Pin]

Discussed in #361

^{Originally posted by He-Pin September 15, 2025}
https://www.pagerduty.com/eng/august-28-kafka-outages-what-happened-and-how-were-improving/

[He-Pin]

1. Make it not a case class, but with explicit new or create
2. Do some caching if it points to the same config?

We may be add SendProducer#create method for both javadsl and scaladsl