I set up a Kafka cluster with three brokers. What else do I need to configure so that if one broker goes down, the cluster can still serve data from the other brokers?

To achieve high availability in a three‑broker Kafka cluster, you need to: 1) Set the topic replication factor to at least 2 (or 3 for stronger durability). 2) Configure default.replication.factor=2 so new topics are replicated automatically. 3) Enable auto.leader.rebalance.enable=true so that if a broker fails, leaders are reassigned. 4) Set min.insync.replicas to a value less than the replication factor to allow writes when one replica is down, but still protect against data loss. 5) Ensure ZooKeeper is highly available (use a separate ensemble). 6) Tune unclean.leader.election.enable=false to prevent leader election to an out‑of‑sync replica. 7) Monitor broker health with JMX or Kafka Manager and set up alerts. With these settings, if one broker fails, the remaining brokers will continue to serve data and the cluster will automatically elect new leaders for the affected partitions.