gitlab-02 low on disk space

nagios is warning about disk usage on gitlab-02

Filesystem                                    Size  Used Avail Use% Mounted on
udev                                          7.8G     0  7.8G   0% /dev
tmpfs                                         1.6G  596K  1.6G   1% /run
/dev/sdd1                                      30G   16G   12G  58% /
tmpfs                                         7.9G  948K  7.9G   1% /dev/shm
tmpfs                                         5.0M     0  5.0M   0% /run/lock
tmpfs                                         7.9G     0  7.9G   0% /tmp
/dev/mapper/vg_gitlab--02-var--opt            197G  171G   18G  91% /var/opt
/dev/mapper/vg_gitlab--02_hdd-gitlab--backup  295G   21G  274G   8% /srv/gitlab-backup
/dev/mapper/vg_gitlab--02_hdd-gitlab--shared  275G  159G  103G  61% /srv/gitlab-shared
tmpfs                                         1.6G     0  1.6G   0% /run/user/0

the /var/opt partition is the problematic disk here. that disk has pretty consistent usage and doesn't change much, but yesterday it jumped from 87% used to 81% used, and that's what triggered the nagios check. i think adding another 10G to the disk would be good. it silences the check and gives us a buffer for when that disk's usage spikes