Requesting a way to prevent MariaDB Monitor from promoting a replica which has had an Error 1236 - ER_MASTER_FATAL_ERROR_READING_BINLOG - or similar fatal replication error.
Suggesting a parameter for MariaDB Monitor, something like auto_failover_strict_mode.
In the referenced support case, customer had a primary with two replicas. One replica was out of sync due to a 1236 error. In a subsequent failover situation, the out of sync replica was promoted to primary, causing the other nodes to be out of sync later.
A parameter such as auto_failover_strict_mode would have prevented MariaDB Monitor from promoting the out of sync replica, even if that would result in a longer outage.