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  1. Client discovery: Provide an API to programmatically access the metadata. Here, the “metadata” refers to the cluster-wide finalized versions maximum versions of broker features (also referred to as feature version level) . We would like to serve this metadata in an eventually consistent and scalable way.

  2. Feature gating: Provide an API to safely, durably and dynamically finalize the upgrades to cluster-wide maximum versions of features. The API (and it’s related tooling) can be used by the cluster operator (i.e. typically a human) to finalize feature version upgrades.

  3. IBP deprecation: As a good side-effect of the above, we would like to provide a path to eventually deprecate the need for the cumbersome inter.broker.protocol configuration, and the broker “double roll” mechanism. A very tangible benefit of the solution is that we should be able to do broker upgrades with just a single rolling restart.

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