@Override
  public void memberSuspect(final ID suspect, final ID whoSuspected, final String reason) {

  }
MembershipListenerNoOp is the default implementation of MembershipListener. Construct and
install your own if you want to receive membership events.
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/MembershipListenerNoOp.java