if (!stopwatch.isRunning() && !(service instanceof NoOpService)) {
            loadTimes.add(Maps.immutableEntry(service, stopwatch.elapsed(MILLISECONDS)));
          }
        }
      } finally {
        monitor.leave();
      }
      sort(loadTimes, Ordering.natural().onResultOf(Entry::getValue));
      return ImmutableMap.copyOf(loadTimes);
    }

    /**
     * Updates the state with the given service transition.