Why This Cheat Sheet Matters for AZ-400
This cheat sheet covers the most important Release Strategy & SRE concepts tested on the AZ-400 (Azure DevOps Engineer Expert) certification exam. It contains 2 sections with 8 key points that you should memorize before exam day. Use this as a quick-reference guide during your final review sessions.
2Sections
8Key Points
Release Strategies
- Blue-green: two identical environments; switch traffic after validation.
- Canary: route small percentage of traffic to new version; expand if healthy.
- Ring-based: deploy to expanding rings (canary → early adopters → all).
- Feature flags: toggle features independently of deployments.
Monitoring & SRE
- SLI: measurable indicator of service health (e.g., request latency).
- SLO: target value for an SLI (e.g., 99.9% of requests < 200ms).
- Error budgets: acceptable failure rate before halting feature work.
- DORA metrics: deployment frequency, lead time, MTTR, change failure rate.
Practice Release Strategy & SRE Questions
Put your knowledge to the test with practice questions.
Azure Quick Reference Tips
Azure services follow consistent naming patterns that help with exam recall. Resource Manager (ARM) templates use JSON, while Bicep provides a cleaner DSL for infrastructure as code. Remember that Azure resources are organised in a hierarchy: Management Groups → Subscriptions → Resource Groups → Resources.