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Thanks to microservices we need 45 kubernetes nodes to handle our 1000 requests a second!

Assuming those requests are evenly distributed over time, yes. But in the event of an attack you would see a sudden surge in requests followed by a flatline, and still end up at 1B/month over 30 days.

> can be likely handled by a single well configured server.

A single core, actually, after JVM JIT kicked in.