15.35Deployment rollback

Suppose:

1.2.4

deploys and error rate immediately spikes.

You need a rollback strategy.

Conceptually:

stop routing traffic to 1.2.4
 ↓
restore known-good 1.2.3

Exact mechanisms depend on environment and deployment process.

The important point:

Rollback should use a known-good immutable artifact, not emergency code editing in production.