code: def _get_all_initialized_channels(self):
          
          channels_dict = defaultdict(list)
          for service_base_dir in self._get_persistent_mpe_dir().glob("*/*"):
              org_id     = service_base_dir.parent.name
              service_id = service_base_dir.name
              channels   = self._get_initialized_channels_for_service(org_id, service_id)
              if (channels):
                  channels_dict[(org_id, service_id)] = channels
          return channels_dict
docs: return dict of lists  rez[(<org_id>, <service_id>)] = [(channel_id, channel_info)]