Customers do not currently have a way to surface fine-grained details around their repository. All they have access to is the information how big that repository is. This means that those customers cannot easilyi figure out performance-related information around repositories on their own without either involving support or executing Git commands in the on-server repository itself. We should provide a UI to surface repository-level information: - What is the repository's total size? - Which format does the repository use? - Does the repository have supporting metadata like commit graphs, bitmaps and multi-pack indices? How old are they? - How large are the objects? - How many objects are there? - Which types do these objects have? - How many refs are there? Gitaly already exposes a lot of this information via the `RepositoryInfo()` RPC. We should expose that information to make repositories more self-serviceable and improve the handoff between customers and GitLab.