UPGRADE FROM 5.0 to 5.1

Console

Deprecated passing $usePutenv argument to Dotenv's constructor, use Dotenv::usePutenv() instead.

Deprecated LegacyEventDispatcherProxy. Use the event dispatcher without the proxy.

Implementing the FormConfigInterface without implementing the getIsEmptyCallback() method is deprecated. The method will be added to the interface in 6.0.
Implementing the FormConfigBuilderInterface without implementing the setIsEmptyCallback() method is deprecated. The method will be added to the interface in 6.0.

Deprecated passing a RouteCollectionBuiler to MicroKernelTrait::configureRoutes(), type-hint RoutingConfigurator instead
Deprecated not setting the "framework.router.utf8" configuration option as it will default to true in Symfony 6.0

Deprecate Response::create(), JsonResponse::create(), RedirectResponse::create(), and StreamedResponse::create() methods (use __construct() instead)
Made the Mime component an optional dependency

Deprecated AmqpExt transport. It has moved to a separate package. Run composer require symfony/amqp-messenger to use the new classes.
Deprecated Doctrine transport. It has moved to a separate package. Run composer require symfony/doctrine-messenger to use the new classes.
Deprecated RedisExt transport. It has moved to a separate package. Run composer require symfony/redis-messenger to use the new classes.
Deprecated use of invalid options in Redis and AMQP connections.

[BC BREAK] The ChatMessage::fromNotification() method's $recipient and $transport arguments were removed.
[BC BREAK] The EmailMessage::fromNotification() and SmsMessage::fromNotification() methods' $transport argument was removed.