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.

                log.debug("Removing expired " + links.map);
            }
            roots.remove(root);
            links = null;
        }

        if (links == null) {
            log.trace("Loadings roots");
            final String refServerName = domain;
            dr = fetchRootReferral(tf, domain, root, refServerName);
            links = cacheRootReferral(tf, domain, root, roots, dr, links);