public FeatureVersion[] featureVersions() {
        return featureVersions;
    }
Features defined. If a feature is included in this list, and marked to be used in production they will also be specified when
formatting a cluster via the StorageTool. MetadataVersion is handled separately, so it is not included here.

See {@link TestFeatureVersion} as an example. See {@link FeatureVersion} when implementing a new feature.
server-common/src/main/java/org/apache/kafka/server/common/Features.java