Is there support for fetch from follower?

[tpitale]

The confluent kafka c library has support for fetch from follower (FFF) https://github.com/confluentinc/librdkafka/blob/a7ddb1ee927c77c1cb20434db14129b3265026bb/INTRODUCTION.md#fetch-from-follower

And it seems like kafka_protocol supports setting the rack_id, and there is an open PR in Brod for support of rack_id #543.

But one of the comments says:

If that's the case, it might not be very useful here because brod_consumer always fetches from the partition leader.

So, I guess the question is, does Brod support fetch from follower? If not, is it something that could be added? It's unclear from the librdkafka docs how that's actually done … it only mentions the client.rack setting.