@Override
  public Map<String, Long> getMessageState(ID member, boolean includeMulticast,
      Map<String, Long> result) {
    services.getMessenger().getMessageState(member, result, includeMulticast);
    return result;
  }
returns the surpriseMemberTimeout interval, in milliseconds
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/GMSMembership.java