etc/systemd/system/zfs-scrub-monthly@.timer.in

   1 [Unit]
   2 Description=Monthly zpool scrub timer for %i
   3 Documentation=man:zpool-scrub(8)
   4
   5 [Timer]
   6 OnCalendar=monthly
   7 Persistent=true
   8 RandomizedDelaySec=1h
   9 Unit=zfs-scrub@%i.service
  10
  11 [Install]
  12 WantedBy=timers.target