'Arguments:
quota (Quota, optional): Upper or lower bound of a value.
samples (int, optional): Max number of samples kept per metric.
event_window (int, optional): Max number of values per sample.
time_window_ms (int, optional): Max age of an individual sample.
tags (dict of {str: str}, optional): Tags for each metric.'

def __init__(self, quota=None, samples=2, event_window=sys.maxsize, time_window_ms=(30 * 1000), tags=None):

    self.quota = quota
    self._samples = samples
    self.event_window = event_window
    self.time_window_ms = time_window_ms
    self.tags = (tags if tags else {})
