Check manual page of zpool_status
|ZFS Storage Pool: Status|
|Distribution||official part of Check_MK|
/usr/sbin/zpool status -x. If the zpool is healthy you're OK. If an inventoried zpool has been destroyed or has an error the check goes CRITICAL. If the extend state information from zpool status indicates any CRC or other errors, the check will go to WARNING.
One service is created for each host if there are any pools.