Refering case id 30318568, the log retention limit only 10 days as it is hard coded. We have an issue when incident happen when user want to know who is the user adding the ip on blacklist list however the incident we are referring to is dated 2 months ago and central manager log gets purged every 10 days hence there is no way we can find the user who added IP in blacklist. Current version we are using is 3.1.0-678
Please consider this to be added in the new features on incoming release update.