'Stop all scripts in pool. This is done at server reload since
restoring the pool will automatically re-populate the pool.
Args:
interval (int, optional): Only stop tickers with this
interval.'

def stop(self, interval=None):

    if (interval and (interval in self.tickers)):
        self.tickers[interval].stop()
    else:
        for ticker in self.tickers.values():
            ticker.stop()
