out_kafka: add support for dynamic/static headers #1341
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Add support for dynamic or static header for the kafka output plugin
Example:
'docker run --rm --network kafka_default -e value_test='${text}' -it fluent/fluent-bit-local:latest -i dummy -p dummy='{"text": "hello world"}' -p samples=1 -o kafka -p brokers=kafka:9092 -p topics=test_fluentbit -p header="key2 <text>" -vvv'
Gives
kafka-console-consumer --topic test_fluentbit --bootstrap-server kafka:9092 --property print.headers=true
key2:hello world {"@timestamp":1710505560.027627,"text":"hello world"}