There are hooks, services, and OAuth2 support, as well as the API, which internally we leverage to extend GitLab or integrate with other products, kind of the w

There are hooks, services, and OAuth2 support, as well as the API, which internally we leverage to extend GitLab or integrate with other products, kind of the way GitLab CI did before it was merged. Come to think of it, services like Travis CI could integrate with gitlab.com easily (if they wanted to do so).