How is this a modding release? Lol
The only time I saw something that logged players joining and leaving was with NSM from Fed but honestly I don't see how this is useful and I think NSM is outdated or not supported anymore, I'm unable to help you with NSM anyways.
What I would recommend is getting an IW4MAdmin plugin that logs useful events: server status, chat, reports, penalties (warnings, kick, bans etc)
I personally use Zwambro's plugin and it works really nice but Xerxes plugin is also really good, they're mostly the same though
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