Well...actually...ArubaOS-Switch has a maintenance branch (16.02) and three actively developed (features differentiated) newer branches (currently 16.10, 16.09 and 16.08)...with a release cycle where, at some point, each new branch is "forked" (read: generated) by previous branch...so what you should see is, on average, four branches receiving updates...but...you will also see more, reported as current (updated last time months ago).