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Just out of curiosity what was your technology stack ? You can't run a rails app with so many users on a $5 instance :)

It was Nginx + Golang + Cloudflare + Mongo, i managed to have so little resource usage because most of the request were served from CF edge nodes.

Did the CF edge nodes serve only static resources? Or also cached API calls somehow?

most of the traffic was map tiles, the golang part did a mongo query to get some data but that was a minor part of the traffic