docs: def check(self, instance):
          """
          Parse until the end of each tailer associated with this instance.
          We match instance and tailers based on the path to the Nagios configuration file
  
          Special case: Compatibility with the old conf when no conf file is specified
          but the path to the event_log is given
          """
          instance_key = instance.get('nagios_conf', instance.get('nagios_perf_cfg', instance.get('nagios_log', None)))
  
          # Bad configuration: This instance does not contain any necessary configuration
          if not instance_key or instance_key not in self.nagios_tails:
              raise Exception('No Nagios configuration file specified')
          for tailer in self.nagios_tails[instance_key]:
              tailer.check()