}
	err = r.throttle.WaitN(r.ctx, tokens)
	if err != nil {
		return n, err
	}
	n, err = r.r.Read(buf[:need])
	if err != nil {
		r.lastErr = err
		return n, err
	}
	r.m.updateMeasurement(r.opts.BucketOptions, uint64(tokens))
	return n, err
}

// NewMonitoredReader returns reference to a monitored reader that throttles reads to configured bandwidth for the
// bucket.