In Zabbix >6.2.5 we have flexible warning logic that allows to keep LLD rule supported and show warnings in case if there are problems with macros (missing or duplicate for example)
https://www.zabbix.com/documentation/current/en/manual/discovery/low_level_discovery#filter
But there is no option to get notifications in case if any LLD rule gets such warnings as it is still supported and no internal event is created

Some internal event is needed (or any other mechanism) to be able to get notifications for LLDs with warnings

Regards, Elina