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    collect_collation_info: RuntimeDescriptor<
        [
            header: {
                digest: DigestItem[];
                extrinsics_root: FixedSizeBinary<32>;
                number: number;
                parent_hash: FixedSizeBinary<32>;
                state_root: FixedSizeBinary<32>;
            },
        ],
        {
            head_data: Binary;
            horizontal_messages: { data: Binary; recipient: number }[];
            hrmp_watermark: number;
            new_validation_code?: Binary;
            processed_downward_messages: number;
            upward_messages: Binary[];
        },
    >

    Collect information about a collation.

    The given header is the header of the built block for that we are collecting the collation info for.