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I don't think you're right back to a monolith with centralized reporting. Remember, microservices doesn't mean JSON-RPC over HTTP. Passing updates extracted via change data capture and forwarding them to another reporting system is a perfectly viable interface. Data duplication is also an acceptable consequence in this design.

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> Passing updates extracted via change data capture and forwarding them to another reporting system is a perfectly viable interface.

Right, that's the data warehouse method I described, keeping a central database in a reporting system. But now you just have to keep that database schema stable, because folks are going to write reports against it. It's a monolith for reporting, and its schema is going to be affected by changes in upstream systems. It's not like source systems can just totally refactor tables without considering how the data downstream is going to be affected. When Ms. CEO's report breaks, bad things happen.

Sorry, I noticed you made the same observation in another thread after you got dogpiled by everyone; I left my question over there. Yeah, I've had to contend with that problem before -- hard to imagine how I forgot about it :)

You just subscribe a reporting service to certain topics , done .

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