One way to avoid this is to have the microservices to publish data changes to some other (monolith) system, like an MQ system with a specified scheme for the pa

One way to avoid this is to have the microservices to publish data changes to some other (monolith) system, like an MQ system with a specified scheme for the payload. On the other hand, the notion that “microservices == completely independent of everything else” is an unrealistic one to hold.