@Override
    public void endpointCrashed(Endpoint endpoint) {
      for (EndpointListener listener : endpointListeners) {
        listener.endpointCrashed(endpoint);
      }
    }
Used by Endpoint only, when the reference count for this endpoint reaches 0
geode-core/src/main/java/org/apache/geode/cache/client/internal/EndpointManagerImpl.java