code: public static void appendElapsedAndSize(
              StringBuilder buf, long startTimeNanos, long endTimeNanos, long size) {
          appendElapsed(buf, startTimeNanos, endTimeNanos);
          buf.append(", ");
          appendSize(buf, size);
      }
docs: A shortcut method that calls {@link #appendElapsed(StringBuilder, long, long)} and
  {@link #appendSize(StringBuilder, long)}, concatenated by {@code ", "}.