logger.info(
    "calculating delta for stat_id = {}, prev = {}. cur = {}".format(
        stat_id, str(prev_stat["value"]), str(prev_stat["value"])
    )

def stat_type(stat_id):
    """
    Returns the statistic type by a stat id. Returns one of:

     - 'gauge'
     - 'counter'
     - None in case of unrecognized statistics

    This is useful for determining which value should be reported in a dashboard.
    """
    raise Exception("Deprecated Method.")

while xs is None or len(xs) >= n:
    if xs is not None:
        n = n * increase_rate
    if n >= MAX_KEYS:
        raise Exception(f"ERROR: Cannot fetch more than {MAX_KEYS} keys.")
    xs = dconn.prefix_get(stats_prefix, n)