I’m upgrading the fail2ban on our servers from version 0.8.14 to the so called “gamma” version, 0.9.2, because I installed it on the web server and it proved to be more capable and stable than the so called “stable” version.
In particular, on the web server, I had a problem where a jail was matching, regex returned matches, but it did not perform the specified action. Upgrading to 0.9.2 solved this problem. It also took the start up time from around 1-1/2 minutes to 8 seconds for it to re-read the logs.
This should not be service impacting other than it will result in slightly less load on the servers and more reliable security.