Comment # 7 on bug 904518 from Christian Boltz

I'm afraid the fix doesn't work as expected :-(

I have a Tumbleweed system installed about 3 months ago (= long after this bug
was marked fixed), and yesterday the btrfs root partition went full (noticed by
unpack errors in zypper up, and reported by "btrfs fi show"). I had to manually
call btrfs balance to fix it.

There were *no* btrfs-related symlinks in /etc/cron.*

I just enabled and started btrfsmaintenance-refresh.service manually, which
created cron.weekly/btrfs-balance.sh and cron.monthly/btrfs-scrub.sh symlinks.

Please make sure those btrfs maintenance jobs run by default. The best way is
to make sure btrfsmaintenance-refresh.service gets enabled when installing the
package (which also means to enable it in
/usr/lib/systemd/system-preset/*.preset, typically via the
systemd-presets-branding-openSUSE package).