---
- hosts: all
  gather_facts: no

  tasks:
  -  name: ZFS-aware Root FS usage
     shell: [ $(df -hT / |grep -c zfs) -gt 0 ] && zpool list rpool |grep -v ALLOC |awk '(print $3)' || df -h / |awk ' { print $5 } ' |grep -v Use
     register: dfroot

  -  debug:
       msg: "System {{ inventory_hostname }}'s root FS utilization is {{ dfroot.stdout }}"