docs: public Service withDurationHistogram(HistogramEntry... durationHistogram) {
          if (this.durationHistogram == null) {
              setDurationHistogram(new java.util.ArrayList<HistogramEntry>(durationHistogram.length));
          }
          for (HistogramEntry ele : durationHistogram) {
              this.durationHistogram.add(ele);
          }
          return this;
      }