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  1. We introduce 1 new API in the broker RPC interface (see this section). This is the new ApiKeys.UPDATE_FEATURES (schema) that can only be served successfully by the controller.
  2. We introduce few optional fields in the ApiVersionsResponse containing the cluster-wide finalized feature metadata, feature metadata epoch, and the broker's supported features (see this section).
  3. We introduce 2 new APIs in the Admin interface to describe/addOrUpdate/delete features (see this section). Underneath covers, these exercise the APIs mentioned above.

When to use a 'feature', and what are the common use cases?

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Use case: group_coordinator feature flag (for KIP-447)

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