To get the total discount amount applied through price rules for the order

To get the total discount amount applied through price rules for the order

if(class_exists('\Wdr\App\Router')){
    $manage_discount = \Wdr\App\Router::$manage_discount;
    $items = $order->get_items();
    $total_discounts = $manage_discount->getItemTotalDiscount($items);
    //Here you get the total discount amount applied through price rules $total_discounts
}