Even if it's there and judgingly says that I have used half of my /,
it's still nothing to worry about and seeing it there all the time will
give me advance warning if it does become something I need to look at.
I spend most of my morning trying to make this perfect, but as I cannot
reach perfection, maybe it is good enough.
I didn't see that much use for free space of / and trying to add
everything made it feel like too much information, so I ended up to
hiding some information and showing what seemed useful.
At the moment I see volume, load, WLAN signal & frequency, UTC & local
times (with timezone names) and the bar items which would probably be
configured somewhere else.