>>> configure()
    >>> configure('localhost', 8125, 'mymetrics')

def configure(host=DEFAULT_HOST, port=DEFAULT_PORT, prefix=''):
    """
    >>> configure()
    >>> configure('localhost', 8125, 'mymetrics')
    """
    global _client
    logging.info("Reconfiguring metrics: {}:{}/{}".format(host, port, prefix))
    _client = statsdclient.StatsdClient(host, port, prefix)