This is certainly going to make things more interesting at work for a while where we use mod_php a lot! When I say a lot I mean all bar one line of business application uses it.

https://blog.remirepo.net/post/2017/11/17/Fedora-27-changes-in-http-and-php

Switch of the Apache HTTP server in event mode

Since the first days of the distribution, the severs use the prefork MPM.

For obvious performance reasons, we choose to follow the upstream project recommendations and to use the event MPM by default.

This change is also required to have the full benefit and feature of the HTTP/2 protocol via mod_http2.

Switching the servers from prefork and mod_php to event and php-fpm going to take some work and some thinking as to how it can be scripted. We have hundreds of web sites (and PHP settings per site using php_admin_value/php_value Apache commands) and this change will make it to RHEL 8 I guess.