for a deployment scenario we'd like to add tile_age to the /status response reflecting the st_mtime for the graph tar or tile_dir (preferably tile_dir I guess, tar as fallback). ideally it would be returned without verbose=true since that also invokes the whole bbox logic which can be very expensive. so I'd propose to return version and data_age also for the pure "healthcheck" with verbose=false. I can't remember why exactly we chose to not even return the version initially, and that PR has tons of comments..

what do you think?