code: public static Stopwatch start(String name, String... tags) {
      final MonitorConfig.Builder configBuilder = MonitorConfig.builder(name);
      Preconditions.checkArgument(tags.length % 2 == 0,
          "The sequence of (key, value) pairs must have even size: one key, one value");
      for (int i = 0; i < tags.length; i += 2) {
        configBuilder.withTag(tags[i], tags[i + 1]);
      }
  
      return INSTANCE.get(configBuilder.build(), TimeUnit.MILLISECONDS).start();
    }
docs: Returns a stopwatch that has been started and will automatically
  record its result to the dynamic timer specified by the given name, and sequence of (key,
  value) pairs. The timer uses a TimeUnit of milliseconds.