[atrandom]

in my experience, most service API grow by accretion and need to break backward compatibility very very rarely. Naturally, clients should always be Tolerant Readers.

So in many case, you will have only a single version per service.

Moreover, imo, when we are talking about internal apis, there should be nothing preventing the service owner from updating the consumers if he wishes to converge more quickly after breaking compatibility - just like he would when refactoring a monolith. The culture should allow and encourage this kind of collaboration.