Ceph status in HEALTH_ERR: all pools are full

Issue

• Ceph status shows HEALTH_ERR and all pools currently full:

sh-5.1$ ceph -s
  cluster:
    id:          [...]
    health: HEALTH_ERR
            1 backfillfull osd(s)
            1 full osd(s)
            1 nearfull osd(s)
            12 pool(s) full

• Even after deleting the more impactful PersistentVolume objects, the HEALTH_ERR statut remains even though the pools are not at capacity anymore:

--- POOLS ---
POOL                                                   ID  PGS   STORED  OBJECTS     USED   %USED  MAX AVAIL
ocs-storagecluster-cephblockpool                        1  128  530 GiB  142.79k  1.6 TiB  100.00        0 B
ocs-storagecluster-cephobjectstore.rgw.otp              2    8      0 B        0      0 B       0        0 B
ocs-storagecluster-cephobjectstore.rgw.buckets.non-ec   3    8      0 B        0      0 B       0        0 B
ocs-storagecluster-cephobjectstore.rgw.control          4    8      0 B        8      0 B       0        0 B
ocs-storagecluster-cephobjectstore.rgw.log              5    8  3.3 MiB      348   12 MiB  100.00        0 B
ocs-storagecluster-cephobjectstore.rgw.meta             6    8  5.9 KiB       26  240 KiB  100.00        0 B
.rgw.root                                               7    8  5.4 KiB       17  192 KiB  100.00        0 B
ocs-storagecluster-cephobjectstore.rgw.buckets.index    8    8   31 MiB       44   93 MiB  100.00        0 B
ocs-storagecluster-cephfilesystem-metadata              9   32  331 MiB  147.12k  992 MiB  100.00        0 B
ocs-storagecluster-cephobjectstore.rgw.buckets.data    10   32   22 GiB  171.61k   68 GiB  100.00        0 B
ocs-storagecluster-cephfilesystem-data0                11   32   31 GiB  621.84k   97 GiB  100.00        0 B
.mgr                                                   12    1  5.8 MiB        3   17 MiB  100.00        0 B