US-2: ECS Fargate Spot (70% Cost Savings)

As a DevOps engineer, I want to deploy ECS Fargate services with Spot capacity (70% savings), so that container costs are optimized with Infracost-validated estimates.

INVEST Score

I	N	V	E	S	T	Avg
9	8	9	9	7	9	8.5

Sprint: 2 | WSJF: 2.0 | Effort: 5 days | Status: Approved

Acceptance Criteria

• terraform validate passes for ecs-platform module
• terraform test passes (>= 3 test cases)
• Fargate Spot strategy: base=20 FARGATE, weight=50 FARGATE_SPOT
• KMS ephemeral storage encryption (APRA CPS 234 Para 21(d))
• Enhanced Container Insights enabled
• FOCUS 1.2+ tags on ALL resources
• checkov -d modules/ecs-platform/ zero HIGH/CRITICAL
• Infracost estimate documents Fargate pricing baseline

Related ADRs

• ADR-001: Module Naming
• ADR-004: Three-Tier Testing
• ADR-008: Tag Governance

GitHub Issue

• US-2 on GitHub