@Override
  public void close() {
    try {
      synchronized (this) {
        isClosed = true;
        persistentMemberManager.removeRevocationListener(profileChangeListener);
        cacheDistributionAdvisor.removeProfileChangeListener(profileChangeListener);
        persistentStateListeners = Collections.emptySet();
        releaseTieLock();
      }
    } catch (CancelException e) {
      logger.debug("persistence advisor close abridged due to shutdown", e);
    } catch (Exception ex) {
      logger.warn("persistence advisor close has failed.", ex);
    }
  }
Returns the set of missing members that we report back to the any admin DS looking for missing
members.
geode-core/src/main/java/org/apache/geode/internal/cache/persistence/PersistenceAdvisorImpl.java