I just started a Twitter / Mastodon / LinkedIn poll to learn, what is the status of syslog-ng 4 in your environment?
Of course, I'd also be happy to hear some feedback, not just a poll result. So, let me know why you are on syslog-ng 4 already, or why do you delay your upgrade to this new major version!
If hearing about syslog-ng 4 completely surprised you, check
https://www.syslog-ng.com/community/b/blog/posts/upgrade-problems-from-syslog-ng-3-to-4 which describes some of the major changes, and what to be careful about when you upgrade!