code: func (h *PCPHistogram) Buckets() []*HistogramBucket {
  	b := h.h.Distribution()
  	buckets := make([]*HistogramBucket, len(b))
  	for i := 0; i < len(b); i++ {
  		buckets[i] = &HistogramBucket{b[i].From, b[i].To, b[i].Count}
  	}
  	return buckets
  }
docs: // Buckets returns a list of histogram buckets.