Deployment Patterns

Many methods or patterns are available for differing deployment strategies, depending on the use cases involved, criticality of the systems, allowed downtime, etc.

A few of these available and commonly useda are linked below.

Pattern	User Impact	Traffic Routing	Rollback Simplicity	Use Case
Shadow	None	Duplicated (not returned)	N/A (no effect on users)	Test behaviour safely in prod environment
Blue/Green	None	Switched all-at-once	✅ Very easy	Controlled full version swap
Canary	Some users	Gradual % rollout	⚠️ Moderate	Progressive exposure to production
A/B Testing	Some users	Split test groups	Depends	Feature effectiveness or UX testing
Rolling	Some users	Instance-by-instance	⚠️ Moderate	Gradual deployment with minimal downtime
Dark Launch	None	Hidden/disabled features	✅ Very easy	Test infrastructure with real traffic