code: protected ColumnFamilyHistogram createColumnFamilyHistogram(String name, Histogram keyspaceHistogram) 
      {
          Histogram cfHistogram = Metrics.newHistogram(factory.createMetricName(name), true);  
          register(name, cfHistogram);
          return new ColumnFamilyHistogram(cfHistogram, keyspaceHistogram, Metrics.newHistogram(globalNameFactory.createMetricName(name), true));
      }
docs: Create a histogram-like interface that will register both a CF, keyspace and global level
  histogram and forward any updates to both