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I've only ever used heroku for free tier level personal projects, but as I understand it they use AWS to do the actual hosting. I can understand an outage affecting their deployment process, but what could cause running servers to go down?

As I typed that out I remembered that they handle DNS, load balancing, and databases, so I guess any one of them.

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All it takes is a load balancer misconfiguration on a core service to take a large scale service down.

it indeed behaved like a routing issue of some kind (my app was still UP, and was still logging, just no traffic could get to it), and a heroku incident status line said "Engineers are recovering affected routing components," so, yup.

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