code: public long registerEventName(String name) throws IOException {
          Preconditions.checkState(endStaticInfoOffset >= 0, "Cannot write name - have not written end of static info marker");
  
          FlatBufferBuilder fbb = new FlatBufferBuilder(0);
          long time = System.currentTimeMillis();
          int offset = UIEvent.createUIEvent(fbb, UIEventType.ADD_NAME, -1, time, 0, 0, (short)-1, 0, 0);
          fbb.finish(offset);
  
          FlatBufferBuilder fbb2 = new FlatBufferBuilder(0);
          int idx = nameIndexCounter.getAndIncrement();
          nameIndexMap.put(idx, name);
          indexNameMap.put(name, idx);
          int strOffset = fbb2.createString(name);
          int offset2 = UIAddName.createUIAddName(fbb2, idx, strOffset);
          fbb2.finish(offset2);
  
          long l = append(fbb, fbb2);
          return l;
      }
docs: Register the event name - "accuracy", "loss", etc for later use in recording events.
  @param name Name to register
  @return Number of bytes written