public void shutdown() {
        cancelPingTask();
        if (primeConnections != null) {
            primeConnections.shutdown();
        }
        Monitors.unregisterObject("LoadBalancer_" + name, this);
        Monitors.unregisterObject("Rule_" + name, this.getRule());
    }
Register with monitors and start priming connections if it is set.
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/BaseLoadBalancer.java