@Override
    public void onError(XdsType type, Status status) {
        if (closed) {
            return;
        }
        if (!eventLoop.inEventLoop()) {
            eventLoop.execute(() -> onError(type, status));
            return;
        }
        notifyWatchers("onError", watcher -> watcher.onError(type, status));
    }
Removes a watcher which waits for a snapshot update.
xds/src/main/java/com/linecorp/armeria/xds/AbstractRoot.java