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One of the things I am really liking about Fastly, other than that it makes the instance incredibly fast from almost everywhere, is the observability. I was poking around and found this graph that shows the origin of traffic to the instance at a given point of time, with the size of the bubble representing how much traffic that pop is getting.

Note the two big circles. One over Germany, and one over Finland. Coincidentally, the location of Hetzner’s two main sites.

Much of that traffic is inter-instance communications. And the reason is that, I strongly suspect, much of the fediverse infrastructure exists in those two Hetzner datacenters.

NB: Hetzner is critical infrastructure for the fediverse.