Getting syslog-ng 4
Version 4 of syslog-ng was released last December. Quite a few people use it already in production. How can you install it for a test drive? It might be already available in your Linux distribution. There are also several unofficial repositories with the latest syslog-ng.
From this blog, you can learn how to check your syslog-ng version, where to check if it is not yet installed, and a few additional resources, if you want to install the latest version from unofficial repositories.
Read more at https://www.syslog-ng.com/community/b/blog/posts/getting-syslog-ng-4