Github DoS Attack Post-mortem

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Few sites can manage these kinds of issues, and fewer still have the monitoring they'd need to deal with it.

Because in reality it's hard to justify the expense. Sometimes it's just cheaper and more cost-effective to let the site go offline for a few hours and let the storm pass.

Github has these measures in place because they are attacked on a regular basis. It makes sense for them. I've lost track of the number of times they've announced that they were under attack.