void sendNetworkPartitionMessage(GMSMembershipView<ID> view) {
    List<ID> recipients = new ArrayList<>(view.getMembers());
    recipients.remove(localAddress);
    NetworkPartitionMessage<ID> msg = new NetworkPartitionMessage<>(recipients);
    try {
      services.getMessenger().send(msg);
    } catch (RuntimeException e) {
      logger.debug("unable to send network partition message - continuing", e);
    }
  }
Sends a message declaring a network partition to the members of the given view via Messenger
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/membership/GMSJoinLeave.java