Ceph MDS' not showing status on some nodes (in Cluster GUI)

[asm0dai]

Hello,
I have a 4 nodes cluster and only recently noted that two of four Ceph's Meta Data Servers not showing their status in Cluster GUI. What it could be and why?

root@naun02:~# ceph -s
cluster:
id: e4ff8f7f-fba2-4559-98ef-5069a291405c
health: HEALTH_OK

services:
mon: 3 daemons, quorum naun01,naun02,naun03 (age 4d)
mgr: naun04(active, since 4d), standbys: naun01, naun03, naun02
mds: 1/1 daemons up, 3 standby
osd: 28 osds: 28 up (since 4d), 28 in (since 4d)

data:
volumes: 1/1 healthy
pools: 4 pools, 417 pgs
objects: 282.85k objects, 1002 GiB
usage: 4.1 TiB used, 8.6 TiB / 13 TiB avail
pgs: 417 active+clean

io:
client: 0 B/s rd, 121 KiB/s wr, 0 op/s rd, 14 op/s wr

root@naun02:~# ceph versions
{
"mon": {
"ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable)": 3
},
"mgr": {
"ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable)": 4
},
"osd": {
"ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable)": 28
},
"mds": {
"ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable)": 2
},
"overall": {
"ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable)": 37
}
}
root@naun02:~#

Is that only GUI-related issue? Or what? Everything else looks like working normal.

 

[asm0dai]

Solved.
Simple restart of the corresponding service restored the indication.

systemctl restart ceph-mds@naun04.service