Ceph - Ceph reports "100.000% pgs unknown"

Issue

Ceph reports "100.000% pgs unknown"

# ceph -s
  cluster:
    id:     f385fe43-2894-4f15-9ec0-6ee405cab9e0
    health: HEALTH_WARN
            Reduced data availability: 144 pgs inactive

  services:
    mon: 3 daemons, quorum mons-2,mons-0,mons-1 (age 52m)
    mgr: mons-1(active, since 2w), standbys: mons-0, mons-2
    mds: cephfs:1 {0=mdss-0=up:active}
    osd: 15 osds: 14 up (since 40m), 14 in (since 30m)
    rgw: 1 daemon active (rgws-0.rgw0)

  data:
    pools:   6 pools, 144 pgs
    objects: 0 objects, 0 KiB
    usage:   108 GiB used, 266 GiB / 373 GiB avail
    pgs:     100.000% pgs unknown
             144 unknown