docs: public static TraceId generateRandomId(Random random) {
      long idHi;
      long idLo;
      do {
        idHi = random.nextLong();
        idLo = random.nextLong();
      } while (idHi == INVALID_ID && idLo == INVALID_ID);
      return new TraceId(idHi, idLo);
    }