code: public static void showOnlyChannels(Object... channels){
      for(LogRecordHandler handler : handlers){
        if(handler instanceof VisibilityHandler){
          VisibilityHandler visHandler = (VisibilityHandler) handler;
          visHandler.hideAll();
          for (Object channel : channels) {
            visHandler.alsoShow(channel);
          }
        }
      }
    }
docs: Show only the given channel.
  @param channels The channels to show