public Map<String, FinalizedVersionRange> finalizedFeatures() {
        return new HashMap<>(finalizedFeatures);
    }
Returns a map of finalized feature versions. Each entry in the map contains a key being a
feature name and the value being a range of version levels supported by every broker in the
cluster.
clients/src/main/java/org/apache/kafka/clients/admin/FeatureMetadata.java