def __init__(self, qps, unavailable_qps=0.0, qps_counter=None, backoff_counter=None):
    self._qps = qps
    self._unavailable_qps = unavailable_qps
    self._qps_counter = qps_counter
    self._backoff_counter = backoff_counter

    self.available = self._qps - self._unavailable_qps
    self.last_time = time.time()
Looks for a file's metadata in the S3 bucket cache file
dataset/ETHPy150Open viewfinderco/viewfinder/backend/base/rate_limiter.py/RateLimiter.__init__--crossover with--dataset/ETHPy150Open saltstack/salt/salt/fileserver/s3fs.py/_find_file_meta