Cycle Analytics with multi-repo applications or micro services

I want to start off saying that I have found Gitlab very fun and exciting. I have been particularly interested in the cycle analytics and the idea to production paradigm.

The one thing that I am having trouble wrapping my head around is how to apply all of these great features to a micro service based application where each service or web app is a separate repository/project in gitlab. I see how to accomplish all of this for each project but I will have features that span multiple projects and have to manage a single backlog of issues.

I was wondering if anyone has had experience with this setup.