code: HistorizableList getHistorizableList(final String name) {
      return historizableLists.get(name, new Monitors.Factory<HistorizableList>() {
          @Override
          public HistorizableList createMonitor() {
            return new HistorizableList(name, maxHistoryEntriesToKeep);
          }
        });
    }
docs: internally used method to retrieve or create and register a named HistorizableList.
  @param name of the required {@link de.is24.util.monitoring.HistorizableList}
  @return {@link de.is24.util.monitoring.HistorizableList} instance registered for the given name