Yeah I think you'd want the microservice to expose an bulk export API point, to an API specification. It might need to transform data most likely and possibly i

Yeah I think you'd want the microservice to expose an bulk export API point, to an API specification. It might need to transform data most likely and possibly ignore some data. And then you grab data from those and piss them into the lake. The lake now conforms to your published APIs. To me this sounds great. And honestly you should do the same thing with a monolith. Nothing worse than "oh you can't make that schema change because a customer with a read-only view will have broken reports".