docs: public static Datum sampleSystemNow(final boolean medium, final boolean large) {
          Datum d = generateCurrentSample();
          if (d == null)
              return null;
          historyS.addLast(d);
          if (historyS.size() > historySize) historyS.removeFirst();
          if (medium) {
              historyM.addLast(d);
              if (historyM.size() > historySize) historyM.removeFirst();
          }
          if (large) {
              historyL.addLast(d);
              if (historyL.size() > historySize) historyL.removeFirst();
  
          }
          return d;
      }