def continue_iteration(self):
        return self._continue
Determine the timestamp of the checkpoint, enforcing monotonicity.
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/driver.py/Driver.continue_iteration--crossover with--dataset/ETHPy150Open letsencrypt/letsencrypt/certbot/reverter.py/Reverter._checkpoint_timestamp