Design exploration for sparkline of activity for a project

Problem to solve

Today, users don't get much information about the project activity from project lists.

From: https://gitlab.com/gitlab-org/gitlab-ce/issues/26834#note_23246462

Another reason I think people look at the files is to determine how active the project is. The files tab is a clear indication of how often updates are being applied. Github places a sparkline chart on the groups / project list, but when you're in the project, the files give the activity away. If there was an identifiable metric on the project overview page, it would negate the need to see the files. - I don't believe the last commit is a clear indication, as the rest of the files could be two years out of date.

Example:

Further details

(Include use cases, benefits, and/or goals)

Proposal

GitHub is showing a graph in some project views showing the activity over the last year. Let's explore if adding a similar representation helps getting a first glance of how active a project is.

What does success look like, and how can we measure that?

(If no way to measure success, link to an issue that will implement a way to measure this)