code: public static void tag(Object key, Object value)
      {
          Thread currentThread = Thread.currentThread();
          if (currentThread instanceof TaggableThread)
          {
              TaggableThread taggableThread = (TaggableThread) currentThread;
              taggableThread.tagMe(key, value);
          }
      }
docs: Adds a tag, if current thread is TaggableThread, otherwise does nothing.
  @param key
  @param value