@VisibleForTesting
  long getDelay(DistributedRegion dr) {
    return dr.getGemFireCache().getCacheServers().stream()
        .mapToLong(CacheServer::getMaximumTimeBetweenPings).max().orElse(0L);
  }
perform a delta-GII for the given lost member
geode-core/src/main/java/org/apache/geode/distributed/internal/DistributionAdvisor.java