docs: private List<Long> collectLongMetric(String metricGetterName) {
          List<Long> vals = new ArrayList<Long>();
          for(BdbEnvironmentStats envStats: environmentStatsTracked) {
              vals.add((Long) ReflectUtils.callMethod(envStats,
                                                      BdbEnvironmentStats.class,
                                                      metricGetterName,
                                                      new Class<?>[0],
                                                      new Object[0]));
          }
          return vals;
      }