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I believe this depends on your exposure level. If you have one, or maybe no, domain names pointed at your server, you are probably fine. If you have tens, or hundreds, of domains pointed at your server (i.e. you are a web site hoster), you will probably need something like fail2ban.

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On another server with the same setup, there's various services and websites running, so load average is never zero there (due to scrapers) but ssh has yet to catch my eye in htop. Whenever I've looked, even the amount of cpu that a Windows VM uses constantly while idle is many times higher than what ssh uses

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