public Builder histogramQuantiles(double... quantiles){
  histogramPercentiles=new HashSet<>();
  for (  double q : quantiles) {
    histogramPercentiles.add(new Percentile(q));
  }
  return this;
}

public Builder histogramQuantiles ( double ... quantiles ) { histogramPercentiles = new HashSet < > ( ) ; for ( double q : quantiles ) { histogramPercentiles . add ( new Percentile ( q ) ) ; } return this ; }
set which quantiles should be reported as percentiles by this reporter . calling this method overrides the default percentiles ( p75 , p99 ) .
