code: public String getMessage() {
      if (enabled) {
        StringBuilder buf = new StringBuilder();
        printMessage(buf);
        return buf.toString();
      }
      return "metricsDisabled";
    }
docs: Construct and return a message based on the timing and checkpoints. This
  will look like "123.456ms(checkpoint1=100.228ms,checkpoint2=23.228ms)"
  without the quotes. There will be no spaces or tabs in the output.
  
  <p>This will automatically call the done() method to stop the timer if
  you haven't already done so.</p>
  
  @return a string with timing information, or {@code "metricsDisabled"}
  if {@code false} was passed in the constructor.
  @see #printMessage(StringBuilder)