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Cluster Mirroring will be introduced through a phased rollout across multiple Kafka releases to ensure stability and gather community feedback. 

Release Phases

Early access

Cluster Mirroring is introduced as an early access feature, disabled by default to prevent accidental production usage. To enable it, all cluster nodes (controllers and brokers) must explicitly enable unstable API versions (unstable.api.versions.enable=true) and unstable feature versions (unstable.feature.versions.enable=true) in all configuration files. After starting the cluster with a minimum metadata version, operators can dynamically enable the mirror version feature to activate Cluster Mirroring (bin/kafka-features.sh --bootstrap-server :9092 upgrade --feature mirror.version=1). This stage is intended for testing and evaluation in non-production environments only, as the new APIs and metadata record formats may change in subsequent releases without backward compatibility guarantees.

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