code: public function channel(string $channel_id) : LoggerChannelInterface
      {
          $logger = $this->log_manager->get($channel_id);
          if (!$logger){
              return new NullLoggerChannel();
          }
          return new CalgamoLoggerChannelAdapter($logger);
      }
docs: Get channel logger
  
  @param string $channel_id
  
  @return LoggerChannelInterface