class DropWizardMetricsHandler extends ChannelInboundHandlerAdapter {
    private MetricRegistry metrics;
    private Meter publishesMetrics;
    private Meter subscribeMetrics;
    private Counter connectedClientsMetrics;

    public void init(IConfig props) {
        this.metrics = new MetricRegistry();
        this.publishesMetrics = metrics.meter("publish.requests");
        this.subscribeMetrics = metrics.meter("subscribe.requests");
        this.connectedClientsMetrics = metrics.counter("connect.num_clients");
//        ConsoleReporter reporter = ConsoleReporter.forRegistry(metrics)
//            .convertRatesTo(TimeUnit.SECONDS)
//            .convertDurationsTo(TimeUnit.MILLISECONDS)
//            .build();
//        reporter.start(1, TimeUnit.MINUTES);
        final String email = props.getProperty(METRICS_LIBRATO_EMAIL_PROPERTY_NAME);
        final String token = props.getProperty(METRICS_LIBRATO_TOKEN_PROPERTY_NAME);
        final String source = props.getProperty(METRICS_LIBRATO_SOURCE_PROPERTY_NAME);

        Librato.reporter(this.metrics, email, token)
            .setSource(source)
            .start(10, TimeUnit.SECONDS);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object message) {<FILL_FUNCTION_BODY>}

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        String clientID = NettyUtils.clientID(ctx.channel());
        if (clientID != null && !clientID.isEmpty()) {
            this.connectedClientsMetrics.dec();
        }
        ctx.fireChannelInactive();
    }

}

        MqttMessage msg = (MqttMessage) message;
        MqttMessageType messageType = msg.fixedHeader().messageType();
        switch (messageType) {
            case PUBLISH:
                this.publishesMetrics.mark();
                break;
            case SUBSCRIBE:
                this.subscribeMetrics.mark();
                break;
            case CONNECT:
                this.connectedClientsMetrics.inc();
                break;
            case DISCONNECT:
                this.connectedClientsMetrics.dec();
                break;
            default:
                break;
        }
        ctx.fireChannelRead(message);
    
<no_super_class>