func newBucketMeasurement(initTime time.Time) *bucketMeasurement {
	return &bucketMeasurement{
		startTime: initTime,
	}
}

// incrementBytes add bytes reported for a bucket.
func (m *bucketMeasurement) incrementBytes(bytes uint64) {
	atomic.AddUint64(&m.bytesSinceLastWindow, bytes)
}

// updateExponentialMovingAverage processes the measurements captured so far.