This error message seems related,

févr. 23 10:02:45 xxxx mariadbddxxx]: 2024-02-23 10:02:45 0 Warning] Could not increase number of max_open_files to more than 32000 (request: 64000)

Here is an extract of our configuration:

SHOW VARIABLES LIKE '%files_limit%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| open_files_limit | 64000 |
+------------------+-------+
1 row in set (0,001 sec)

systemctl show mariadb | grep LimitNOFILE
LimitNOFILE=65536
LimitNOFILESoft=65536

centreon@xxxx~$cat /proc/sys/fs/file-max
65000

centreon@xxxx~$ echo "show variables"| mysql -p | grep table_open_cache
table_open_cache    2000

centreon@xxxx~$echo "show variables"| mysql -p | grep max_conne
max_connections    151