We've observed two errors with Kafka on both our 120 node AWS environment as well as our 40 node BM environment.

First is a kafka-cluster error relating to KafkaInterBrokerProtocalVersion

And second is ingestion errors picked up by our netobserv_ingest_errors query due to TimeFlowEnd missing code 

Both of the above screenshots are from the Baremetal environment - both occur roughly around the same time after install so there is a chance they are related.