New models passing offline tests don't guarantee production wins. Real-world data shifts, latency changes, specific segments fail. Smart deployment risks incrementally, measures, rolls back fast if needed. Today covers A/B testing (compare side-by-side), blue/green (full swap + rollback), canary (gradual ramp), shadow (zero-risk test), and rollback chains.
All strategies rest on one mechanism: multiple Variants, traffic weights.
from sagemaker.session import production_variant