1. Question 1 — Availability SLO Monitoring

🟩 Uptime check
❌ Readiness probe
❌ Health check
❌ Liveness probe

Explanation:
An Uptime Check monitors whether your service is reachable from outside and helps verify if you are meeting your availability SLO. Probes and health checks are internal to Kubernetes/Compute Engine and do not measure user-visible availability.

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2. Question 2 — Cheapest VMs for Test Environments

🟩 Preemptible machines
❌ Sole tenant nodes
❌ Committed use discount
❌ Sustained use discount

Explanation:
Preemptible VMs are up to 80% cheaper than regular VMs. Since downtime is acceptable for test environments, preemptible VMs give the biggest cost savings.

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3. Question 3 — Test New Version With Small Traffic Portion

❌ Rolling update
❌ Blue/green deployment
🟩 Canary deployment
❌ A/B testing

Explanation:
A Canary deployment sends a small percentage of real traffic to a new version. This is exactly suited for testing a minor update in production.

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4. Question 4 — Deploy With Zero Downtime

❌ Canary deployment
🟩 Blue/green deployment
❌ Rolling update
❌ A/B test

Explanation:
A Blue/Green deployment runs two identical environments (blue=old, green=new). You switch traffic instantly → zero downtime rollback and release.

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🧾 Summary Table

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