First Step- You will need put the user parameter below in your zabbix_agent.conf

UserParameter=vfs.fs.mounted[*],findmnt -nr -o source -T $1 > /dev/null && echo 0 || echo 1

this parameter will return if the mount point is OK

Second Step - Import the template

Third Step -  Change the Item Key, You need put your mount point, like the exemple below.

ex: vfs.fs.mounted[put your mounte point here]