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As for monitoring there are plenty of tools to do that. You have bigger problems if you expect your services to go down often.

Yes, even in your monolithic app, you probably used some tooling to monitor it. But now that single service being monitored has multiplied into 10-20 services being monitored.

Nobody expects their services to go down, but if you don't plan for it, then that means you haven't thought about high availability or disaster recovery enough.