How would you answer an interview scenario involving GraphQL schema evolution?

In an interview, I would first define GraphQL schema evolution and the problem it solves, then explain how I would favor additive changes, mark fields deprecated with migration guidance, measure field usage, keep old behavior during a transition window, and remove fields only after consumers migrate. I would also call out the main failure mode: renaming or removing fields immediately because the server no longer uses them can break clients that deploy on independent schedules. Finally, I would describe how I would test, monitor, and safely roll back or recover the solution.