Express Middleware Dependency Injection

[Immortalin]

It would be useful to allow developers to inject express middleware into the Remix App Server without having to setup a separate express server instance. For example, if you want to add Prometheus metrics to your production app right now, you will need to serve the Remix app with your own express server.

https://scottsmerchek.com/blog/setting-up-production-monitoring-for-remix-on-fly-io