Disk Space alerting on <90 with VSI's having filesystems with /dev/loop at 100%

[rbelsch]

I have been trying to remediate a trigger for disk space <90.

This isn't an issue on any of our Baremetal servers but VSI's have a dev/loop* filesystem that cause the trigger to go off constantly.

the current trigger expression is:
last(Template-OS-Linux-VPN/vfs.fs.size[/,pfree])<90

discovery uses the Linux by Zabbix agent and gets moved to the above template.

On the Linux by Zabbix Agent template I have added to the discovery rule for Mounted filesystem discover the following:
Filter: {#FSNAME} matches @File systems for discovery exclude

under admin -> general - regular expressions I have:
File systems for discovery exclude
expressions -
Results are FALSE ^(/loop)$

the filesystems in question are:
/dev/loop0 64M 64M 0 100% /snap/core20/2015
/dev/loop1 64M 64M 0 100% /snap/core20/2105
/dev/loop2 92M 92M 0 100% /snap/lxd/24061
/dev/loop4 41M 41M 0 100% /snap/snapd/20290
/dev/loop5 41M 41M 0 100% /snap/snapd/20671

I'm not sure if the expression should be on /snap or the loop?

[cyber]

it is a regex you need there... not exact match.
^(/loop)$ will match /loop and nothing more. But to your question... assuming you use either vfs.fs.get or vfs.fs.discvoery to get all FS-es... those use "Mounted on" not "Filesystem" for items... So matching for /loop will not work. You should probably try to exclude ^(/snap/.*)$