private void updateStatistic(Stat stat) {
    for (final Statistic statistic : statistics) {
      if (statistic.getName().equals(stat.getName())) {
        ((StatisticImpl) statistic).setStat(stat);
        return;
      }
    }
    Assert.assertTrue(false, "Unknown stat: " + stat.getName());
  }
Value that uniquely identifies an instance of a cache for a given member.
geode-core/src/main/java/org/apache/geode/admin/internal/SystemMemberCacheImpl.java