materculae out of disk space

previous ticket: #40826 (closed)

it's been a year, and nagios is complaining about materculae's /srv partition

# df -h /srv
Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_materculae-srv  147G  135G  4.3G  97% /srv

in the previous ticket (#40826 (closed)) @anarcat changed the warning threshold, which is why this warning popped up now.

according to grafana, the usage has only been about 15G in the past year, and the growth is linear. we could add another 20G and revisit in a year, or throw 40G or 60G at it to push things further down the road.