Idea: have event streams between microservices always be bilateral (two party) contracts. When you want to make a change, you can pick up the phone to the other

Idea: have event streams between microservices always be bilateral (two party) contracts. When you want to make a change, you can pick up the phone to the other end and get it done quickly. Multilateral contracts easily lead to email chains or meetings over each change, and compromise data structures, similar to the “add a column on the end” culture often used in shared reldbs. What is your motivation for wanting microservices? As an alternative, what about events between the processes of single codebase? In that case, when you want a schema change - change it, run your tests to see that all modules comply, redeploy everything.