Hello, We're upgrading our Kafka from 1.1.0 to 2.4.1 and I'm wondering if ZK needs to be upgraded too (we're currently on 3.4.6). The upgrade guide says that "kafka has switched to the XXX version of ZK" but never says if switching to a newer ZK is mandatory or not. What are the guidelines on keeping Kafka and ZK compatible?
-- Andrey Klochkov
