@joao-subtil welcome to the forum! Sorry about the delay in responding to you.
Also I want to use a higher version than what is currently supported. Currently it would be 2.4.0. Do you guys foresee any potential issues here?
I'd suggest not specifying output.kafka.version at all -- the default (1.0.0) will work for newer brokers too. Increasing the version permits additional Kafka features, but we don't use them.
If you don't specify the version, then the server will work with recent versions of Kafka. I just tested APM Server v7.15.2 with Confluent Platform 6.2.0 (Kafka 2.8.x), and it works well.
I'll see what we can do about clarifying the docs.