STAGES.md lists non-existent event subscription methods

[Disr0]

I am trying to log unsuccessful api calls that result in internal server error, by subscribing to the onMessage event.
Problem is - there is no such method to subscribe to any of the events, unlike listed in stages.md file.

use Luracast\Restler\Restler;
use Luracast\Restler\Defaults;
$api = new Restler();
$api->onMessage(function () use ($api) {
    $error = $api->responseCode == 500;
    if ($error) {
        $request = $api->getRequestData();

        $log = [
            'method'   => $api->requestMethod,
            'url'      => $api->url,
            'status'   => $api->responseCode,
            'route'    => $api->apiMethodInfo->className . '::' . $api->apiMethodInfo->methodName,
            'data'     => $request['request_data'] ?? null,
            'error'    => $api->exception ? $api->exception->getErrorMessage() : null,
        ];
    
        Config::instance()->logger->write($log);
    }
});
$api->handle();

Code above results into:
[2026-04-13 14:33:05] Call to undefined method Luracast\Restler\Restler::onMessage()

I couldn't find code responsible for these methods by searching the source code for events listed in stages.md, I'm not sure if they even exist.