php-sdk broke "suddenly"

[asjur]

We've had a manual trigger for blackfire working for a long time and now it produces an error 500. No code changes has been applied to this for a long time and the only thing that changed was that we moved from PHP7.3 to 8.4 a little while ago.

Using the blackfire browser extension works but we need to be able to trigger manual probes via REST calls as well.

The error in question is:

[31-Jan-2025 13:42:37 Europe/Oslo] PHP Fatal error: Uncaught Error: Class "Blackfire\ClientConfiguration" not found in /home/[REDACTED]/production/releases/75ab326b4e3c66b6dd5c99b306d795edc5d0ea33/public/index.php:146

The error happens on the first line of this codeblock:

$clientConfig = new \Blackfire\ClientConfiguration();
$clientConfig->setClientId('[REDACTED]');
$clientConfig->setClientToken('[REDACTED]');
$blackfire = new \Blackfire\Client($clientConfig);
$probe = $blackfire->createProbe();
register_shutdown_function(static function () use ($blackfire, $probe) {
    $blackfire->endProbe($probe);
});

It is used in the index file of a Symfony project.

When running composer show this is the output, keep in mind that I've tried latest version and slowly gone backwards to see if I could find a working version:

composer show blackfire/php-sdk
name     : blackfire/php-sdk
descrip. : Blackfire.io PHP SDK
keywords : performance, profiler, uprofiler, xhprof
versions : * v2.5.4
released : 2024-09-18, 4 months ago
type     : library
license  : MIT License (MIT) (OSI approved) https://spdx.org/licenses/MIT.html#licenseText
homepage :
source   : [git] https://github.com/blackfireio/php-sdk.git 4b46450f30ef50bcde331d6c360b9f3a3a42bfe6
dist     : [zip] https://api.github.com/repos/blackfireio/php-sdk/zipball/4b46450f30ef50bcde331d6c360b9f3a3a42bfe6 4b46450f30ef50bcde331d6c360b9f3a3a42bfe6
path     : /home/[REDACTED]/production/releases/75ab326b4e3c66b6dd5c99b306d795edc5d0ea33/vendor/blackfire/php-sdk
names    : blackfire/php-sdk

support
issues : https://github.com/blackfireio/php-sdk/issues
source : https://github.com/blackfireio/php-sdk/tree/v2.5.4

autoload
psr-4
Blackfire\ => src/Blackfire

requires
composer/ca-bundle ^1.0
php >=5.3.0

requires (dev)
behat/behat ^3.8
friends-of-behat/mink-browserkit-driver ^1.4
friends-of-behat/mink-extension ^2.5
friends-of-behat/symfony-extension ^2
guzzlehttp/psr7 ^1.6
illuminate/console ^8.81
illuminate/queue ^8.81
illuminate/support ^8.81
laravel/octane ^1.2
phpunit/phpunit ^9.5
psr/http-message ^1.0
symfony/browser-kit ^5.1
symfony/framework-bundle ^5.1
symfony/http-client ^5.1
symfony/messenger ^5.1
symfony/panther ^1.0
symfony/phpunit-bridge ^5.2

suggests
ext-blackfire The C version of the Blackfire probe
ext-zlib To push config to remote profiling targets
symfony/panther To use Symfony web test cases with Blackfire

Any suggestion would be highly appreciated.