was support for log4j been removed?

i see i have no Log4jLogFactory class in snmp4j 2.8.2, but i also don’t see any release notes for it

Yes, log4j has been removed from SNMP4J and moved to a separate package, see the release notes of snmp4j-log4j 2.8.2 at:
https://www.snmp4j.org/log4j/CHANGES.txt