Hi there,

there is a report at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1116027#54:

What exactly did you do (or not do) that was effective (or
ineffective)? With MariaDB 10.11.14-0+deb12u2, check_mysql returns "Slave status unavailable"

On MariaDB 10.11.14-0+deb12u2, the output of "show replica status" command is always identical to that of "show slave status" command.
(there is no "Replica_IO_Running" line).

The codebase is basically 2.4.0 and on top https://salsa.debian.org/nagios-team/monitoring-plugins/-/blob/master/debian/patches/26_check_mysql_replica?ref_type=heads.

It seems like a regression while trying to fix the MySQL 8.4 replica change.