upgrade-sequence:
   sequential:
   - install.upgrade:
       mon.a:
       mon.b:
   - print: "**** done install.upgrade mon.a and mon.b"
   - ceph.restart: [mon.a, mon.b, mon.c, mds.a, osd.0, osd.1, osd.2, osd.3]
   - print: "**** done ceph.restart all"