フリー問題

問題文

A new agent version changes the shape of the state it persists. Does this favor blue/green or canary, and why?

選択肢

1. Canary, because exposing fewer users limits the damage if the new state shape is wrong, and the old version simply ignores fields it does not recognize
2. Blue/green, because canary runs both versions at once and the old version would encounter state written in the new shape
3. Blue/green, because it is always safer than canary
4. Canary, because the state shape can be converted per request