1. Question 1 — Monitoring Availability SLO (99%)

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

Explanation:
An Uptime Check measures whether your service is reachable from outside Google Cloud — exactly what you need to confirm availability SLO. Probes and health checks are internal.

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2. Question 2 — Cheapest Test Environments

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

Explanation:
Preemptible VMs provide the largest cost savings, up to 80% cheaper. Perfect for test environments where downtime is acceptable.

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

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

Explanation:
A Canary deployment allows routing a small percentage of traffic to the new version to test it safely in production.

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4. Question 4 — Deploy With Zero Downtime

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

Explanation:
A Blue/Green deployment runs two complete environments and switches traffic instantly → zero downtime and easy rollback.

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🧾 Summary Table

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