My favorite way to think about this is to apply a reverse Conway's law. Architect your microservices like your org chart.

One of the main benefits of decoupling a monolithic application is getting the freedom to release, scale and manage different components separately. Each team becomes empowered to define their own practices, procedures and policies that are appropriate to their business requirements.

Have a mission-critical component that needs 5 9s reliability (auth or billing)? Great, release that carefully over multiple days with canarying across failure zones. Working on an experimental API for a new mobile app? Awesome, ship every commit.