code: public static String getPrettyMapOfContiguousPartitionRunLengths(final Cluster cluster,
                                                                       int zoneId) {
          Map<Integer, Integer> runLengthToCount = getMapOfContiguousPartitionRunLengths(cluster,
                                                                                         zoneId);
          String prettyHistogram = "[";
          boolean first = true;
          Set<Integer> runLengths = new TreeSet<Integer>(runLengthToCount.keySet());
          for(int runLength: runLengths) {
              if(first) {
                  first = false;
              } else {
                  prettyHistogram += ", ";
              }
              prettyHistogram += "{" + runLength + " : " + runLengthToCount.get(runLength) + "}";
          }
          prettyHistogram += "]";
          return prettyHistogram;
      }
docs: Pretty prints the output of getMapOfContiguousPartitionRunLengths
  
  @param cluster
  @param zoneId
  @return pretty string of contiguous run lengths