def highestMax(requestContext, seriesList, n=1):
    """
    Takes one metric or a wildcard seriesList followed by an integer N.

    Out of all metrics passed, draws only the N metrics with the highest
    maximum value in the time period specified.

    Example::

        &target=highestMax(server*.instance*.threads.busy,5)

    Draws the top 5 servers who have had the most busy threads during the time
    period specified.

    """
    result_list = sorted(seriesList, key=lambda s: max(s))[-n:]
    return sorted(result_list, key=lambda s: max(s), reverse=True)
