At your Service Container
As we all know Drupal 8 has lots of new stuff. One of these items is based on Dependency Injection and result in a new file stored at
sites/defaults/files/php/service_container/service_container_prod.php/e7000f005xxx.php and created very early during the bootstrap of Drupal. But what is it's contents?
As this class is loaded on a running site we can render it with Graph API as we know it's name service_container_prod.
This is what it looks like on my basic install. As you may note almost everything is a service.