docs: def kube_cronjob_next_schedule_time(self, metric, scraper_config):
          """ Time until the next schedule """
          # Used as a service check so that one can be alerted if the cronjob's next schedule is in the past
          check_basename = scraper_config['namespace'] + '.cronjob.on_schedule_check'
          curr_time = int(time.time())
          for sample in metric.samples:
              on_schedule = int(sample[self.SAMPLE_VALUE]) - curr_time
              tags = [
                  self._format_tag(label_name, label_value, scraper_config)
                  for label_name, label_value in iteritems(sample[self.SAMPLE_LABELS])
              ]
              tags += scraper_config['custom_tags']
              if on_schedule < 0:
                  message = "The service check scheduled at {} is {} seconds late".format(
                      time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(int(sample[self.SAMPLE_VALUE]))), on_schedule
                  )
                  self.service_check(check_basename, self.CRITICAL, tags=tags, message=message)
              else:
                  self.service_check(check_basename, self.OK, tags=tags)