docs: def ReturnLeasedCronJobs(self, jobs):
      """Makes leased cron jobs available for leasing again."""
      errored_jobs = []
  
      for returned_job in jobs:
        existing_lease = self.cronjob_leases.get(returned_job.cron_job_id)
        if existing_lease is None:
          errored_jobs.append(returned_job)
          continue
  
        if (returned_job.leased_until != existing_lease[0] or
            returned_job.leased_by != existing_lease[1]):
          errored_jobs.append(returned_job)
          continue
  
        del self.cronjob_leases[returned_job.cron_job_id]
  
      if errored_jobs:
        raise ValueError("Some jobs could not be returned: %s" %
                         ",".join(job.cron_job_id for job in errored_jobs))