code: synchronized void reset(double value, int updated) {
          ewma = value;
          ewmaStddev = value * SINGLE_VALUE_STDDEV;
          ewmaVariance = ewmaStddev * ewmaStddev;
          consecutiveOutliers = 0;
          lastUpdate = updated;
      }
docs: Reset the distribution by throwing away all history and
  adding a single data point.
  
  @param value the single data point that makes up the distribution