Sure, the most obvious link is this: https://gitlab.com/gitlab-com

Here's a few examples:

Runbooks: https://gitlab.com/gitlab-com/runbooks - which I've used as inspiration for runbooks on my own team.

Handbook: https://about.gitlab.com/handbook/

Roadmap/Product Vision: https://about.gitlab.com/direction/

A note in their handbook on transparency: https://about.gitlab.com/handbook/values/#transparency