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Probably non related but I have a question - how do microservices scale in terms of communication to other microservices or to a monolith?

We have broken off two of our monolith’s components into a microservice and for now it’s working great - but there are just some things I don’t think make sense to decouple and isolate. I’m afraid I’d get in an integration hell. Has anyone had such an issue?

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Yes.

When that will happen in your case is highly dependent on what you're doing, but it will happen. Eventually you will run into situations where implementing a single small feature requires changes to 3 or more systems, plus deploying all of those systems to all of your environments, code reviews for each service, etc. The overhead explodes as you break more things apart.

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