GCP Secret Manager, Live-Reloaded in Go With mamori

Google Cloud Secret Manager has a clean, opinionated model: a secret is a container, and inside it live immutable, numbered versions. You never edit a version — you add a new one (1, 2, 3, …) and, when it's ready, you move traffic to it, usually by resolving the latest alias (or by disabling the old version).

It's a genuinely good design. But it collides with how most Go services consume secrets: you call AccessSecretVersion("latest") exactly once, at startup, and cache the result. From that moment your process is pinned to whatever latest meant at boot. Add version 4, disable version 3, and your service happily keeps using 3 until someone restarts it — which, at best, is a scheduled redeploy and, at worst, an incident when the disabled version stops resolving.