Thanks Mark,
that helped me to fix it, thanks! - However, to be specific for others with the same problem - here are the detailss what I did manually
1024 cd /tmp
1025 wget https://github.com/openhab/openhab-distro/raw/main/distributions/openhab/src/main/resources/userdata/etc/log4j2.xml
1026 diff /srv/openhab-userdata/etc/log4j2.xml /tmp/log4j2.xml
1027 cp /srv/openhab-userdata/etc/log4j2.xml /home/openhabian/log4j2.xml.save
1028 cat /tmp/log4j2.xml > /srv/openhab-userdata/etc/log4j2.xml
1029 ls -al /srv/openhab-userdata/etc/log4j2.xml /tmp/log4j2.xml
1030 sudo systemctl restart openhab.service
Result: No more “update” information with no item change at the INFO level!
BTW: Here’s the diff for userdata/etc/log4j2.xml :
# diff /home/openhabian/log4j2.xml.save /srv/openhab-userdata/etc/log4j2.xml
64a65,66
> <Logger level="ERROR" name="openhab.event.ItemStateUpdatedEvent"/>
> <Logger level="ERROR" name="openhab.event.GroupStateUpdatedEvent"/>