code: private Set<String> getOutstandingEvaluatorsAndMarkExpired() {
      final Set<String> outstanding = new HashSet<>();
      for (final String previousEvaluatorId : restartEvaluators.getEvaluatorIds()) {
        if (getStateOfPreviousEvaluator(previousEvaluatorId) == EvaluatorRestartState.EXPECTED) {
          outstanding.add(previousEvaluatorId);
          setEvaluatorExpired(previousEvaluatorId);
        }
      }
  
      return outstanding;
    }
docs: Gets the outstanding evaluators that have not yet reported back and mark them as expired.