code: def timer(name, reservoir_type="uniform", *reservoir_args, **reservoir_kwargs):
      
  
      hmetric = get_or_create_histogram(name, reservoir_type, *reservoir_args, **reservoir_kwargs)
  
      t1 = time.time()
      yield
      t2 = time.time()
      hmetric.notify(t2 - t1)
docs: Time-measuring context manager: the time spent in the wrapped block
      if measured and added to the named metric.