Migrating a message-based system from on-premises to the cloud is a colossal undertaking. If you search for “how to migrate to the cloud”, there are reams of articles that encourage you to understand your system, evaluate cloud providers, choose the right messaging service, and manage security and compliance. Curiously, what’s often missing from the discussion is details, like how to handle all the other on-prem systems that integrate with your system, both upstream and downstream, that...