The zfs module seems to be missing in the referenced kernel/modules thus
the zfs pool is missing and the DB fails to start

# systemctl --failed
  UNIT            LOAD   ACTIVE SUB    DESCRIPTION                    
● mariadb.service loaded failed failed MariaDB 10.11.8 database server

Legend: LOAD   → Reflects whether the unit definition was properly loaded.
        ACTIVE → The high-level unit activation state, i.e. generalization of 
SUB.
        SUB    → The low-level unit activation state, values depend on unit 
type.

1 loaded units listed.

# zpool status
The ZFS modules cannot be auto-loaded.
Try running 'modprobe zfs' as root to manually load them.
root@db1-gra5-old:/home/todor# modprobe zfs
modprobe: FATAL: Module zfs not found in directory 
/lib/modules/6.5.0-060500-generic

# find /lib/modules/6.5.0-060500-generic/ -iname "*zfs*"
# find /lib/modules/ -iname "*zfs*"
/lib/modules/6.8.0-51-generic/kernel/zfs
/lib/modules/6.8.0-51-generic/kernel/zfs/zfs.ko.zst
/lib/modules/6.8.0-52-generic/kernel/zfs
/lib/modules/6.8.0-52-generic/kernel/zfs/zfs.ko.zst

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https://bugs.launchpad.net/bugs/2098375

Title:
  ZFS pool randomly encounters error condition and hangs

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