@Override
    public void handle(JsonObject msg) {
        this.lastPing = System.currentTimeMillis();
        this.socket.send(SocketMessageType.PONG.builder()
                .add("ok", true)
                .toJson()
        );
    }
The time a ping was last received
common/src/main/java/me/lucko/luckperms/common/webeditor/socket/listener/HandlerPing.java