

Fail2ban config can get fairly involved in my experience. I’m probably not doing it the right way, as I wrote a bunch of web server ban rules — anyone trying to access wpadmin gets banned, for instance (I don’t use WordPress, and if I did, it wouldn’t be accessible from my public facing reverse proxy).
I just skimmed my nginx logs and looked for anything funky and put that in a ban rule, basically.
We still use leaded gas for aviation, as does (I believe) the EU (I’m guessing RoW, too).
(Supposed to be banned this year in the EU but AFAICT pushed back until 2032.)