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.