The issue I am facing:
Previously, with PiHole 4.x, syslog are sending to another server (QRadar CE edition) where I can collect queried URLs from PiHole clients. Now after upgrading to PiHole 5, it stopped sending URL queries.
Details about my system:
Raspberry 4 with PiHole 5 installed.
What I have changed since installing Pi-hole:
Upgraded to PiHole 5
Pihole itself does not log to syslog but to /var/log/pihole.log (at least when logging is not disabled and depending on your privacy level).
There is a feature request to send the log to a remote syslog server
You can actually do that by modifying the rsyslog.conf file and telling it what syslog server you want the info to go to. You can find the file in the /etc folder. Or if you are more inclined...if you have WEBMIN loaded on your pihole server, its easier since its web interface makes it easy to add that in.
I send my syslog from pihole to my Synology NAS
Now, what you are asking for is for pihole itself to log its queries and have the pi rsyslog daemon collect and send northbound....Good idea perhaps.