Backward compatibility in syslog-ng by using the version number in syslog-ng.conf
Many users are annoyed by the version number included in the syslog-ng configuration. However, it ensures backward compatibility in syslog-ng. It is especially useful when updating to syslog-ng 4 from version 3, but also when updating within the same major version.
Read more about it at https://www.syslog-ng.com/community/b/blog/posts/backward-compatibility-in-syslog-ng-by-using-the-version-number-in-syslog-ng-conf
