99.99% availability sounds great until you realize that’s 4 minutes and 19 seconds of downtime per month. Four minutes. That’s barely enough time to get paged, open your laptop, authenticate to the VPN, and find the right dashboard. You haven’t even started diagnosing anything yet. I’ve watched teams commit to four-nines SLOs because someone in a leadership meeting said “we need to be best in class.” No capacity planning. No discussion about what it would cost. No understanding that the jump from 99.9% to 99.99% isn’t a 0.09% improvement — it’s a 10x reduction in your margin for error.
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