UnincludedSegment: StorageDescriptor<[], {
    consumed_go_ahead_signal?: Types.UpgradeGoAhead;
    para_head_hash?: FixedSizeBinary<32>;
    used_bandwidth: {
        hrmp_outgoing: [number, {
            msg_count: number;
            total_bytes: number;
        }][];
        ump_msg_count: number;
        ump_total_bytes: number;
    };
}[], false, never>

Latest included block descendants the runtime accepted. In other words, these are ancestors of the currently executing block which have not been included in the observed relay-chain state.

The segment length is limited by the capacity returned from the [ConsensusHook] configured in the pallet.