https://www.confluent.io/blog/preparing-the-consumer-fetch-kafka-producer-and-consumer-internals-part-3/
Kafka Producer and Consumer Internals, 3: Preparing the Consumer Fetch
Third installment of the Producer/Consumer Internals series that covers preparing the consumer fetch: how consumers interact with brokers, coordinate...
kafka producerconsumerinternalspreparingfetch
https://www.ibm.com/docs/en/idr/11.4.0?topic=kafka-adding-headers-producer-record
Adding headers to a Kafka producer record
You can configure all integrated Kafka custom operation processors to include one or more headers in every producer record that is sent to Kafka.
kafka produceraddingheadersrecord