Check manual page of zpool
ZFS Storage Pool sizes
Checks the current size and usage of ZFS storage pools. The information
is read by the agent from zpool list. This check can be configured
using the filesystem rule.
In a simple setup where a pool is mapped 1:1 to a mountpoint and where no
snapshots are used, this will report the same information as the zfsget
The inventory will create one service per pool.