Configuration

<magento-install-dir>/app/code/MyProject/Import/symfony/Resources/config/services.xml
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
    <services>
        <service
                id="import_product.observer.product.website" (1)
                class="MyProject\Import\Product\Observers\ProductWebsiteObserver"/> (2)
    </services>
</container>
1 Unique identifier for the override observer class
2 Path to the override observer class file ProductWebsiteObserver.php