code: func (a *MovAvgAggregation) Predict(numPredictions int) *MovAvgAggregation {
  	a.predict = &numPredictions
  	return a
  }
docs: // Predict sets the number of predictions that should be returned.
  // Each prediction will be spaced at the intervals in the histogram.
  // E.g. a predict of 2 will return two new buckets at the end of the
  // histogram with the predicted values.