In my day we just committed seppuku if our uptime dropped below three-nines. I was always pushing to get my elusive 5th on a high traffic SaaS site I was lead on for many years.

I remember sitting in a Chaos Engineering conference session in Vegas (2009 or 10) while logged into 12 servers on my moto droid via tmux because someone pushed a bad patch while I was out. I just don't understand why I look back at that fondly.