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Great point! I set the target at "three nines five (99.95%)" at one place and had to defend why I wasn't aiming higher. "Because I think we can get it consistently there with minimal drag on engineering. To get substantially higher than that, I think I need to start setting policies that will slow down engineering and that makes no sense."

Also, at the time, we had outages almost every week. At the worst of it, we used to joke that we were "chasing our second eight of uptime..."

Exactly this. That's 9 hours a year, or 43 seconds a day.

Any higher than that, and you have to do LOTS of extra engineering. Hell, I doubt even places like Github and Twitter did much better than that last year (e.g. Dyn).

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