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A new configuration resource type is added for cluster mirrors, which is stored in the cluster metadata internal log:. Both DescribeConfigs and IncrementalAlterConfigs will be bumped to new versions so that clients can check ApiVersionsResponse to determine whether the broker supports mirror configuration management, rather than having to send a request and interpret the error.

public enum Type {
    // ... existing types ... 
    MIRROR((byte) 64, "mirror"); // New type
}

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