Architectural Decisions

This project documents significant architectural decisions using Architectural Decision Records (ADRs). Each record captures the context, options considered, and rationale for a decision.

Decision Log

Deployment Architecture

ADR	Decision	Status
ADR-0001	Three-layer deployment model with independent Terraform state	Accepted
ADR-0002	Dual-stack architecture: Azure SPI and CIMPL side-by-side	Accepted

Runtime & Platform

ADR	Decision	Status
ADR-0004	Istio CNI chaining for sidecar injection on AKS Automatic	Accepted
ADR-0007	Karpenter NodePools for workload isolation	Accepted

Service Patterns

ADR	Decision	Status
ADR-0003	Local Helm chart for SPI stack safeguards compliance	Accepted
ADR-0005	Per-service health probe configuration for OSDU services	Accepted
ADR-0006	Kustomize postrender for CIMPL stack safeguards compliance	Accepted

Creating New ADRs

Use the template at docs/decisions/adr-template.md. Number sequentially and follow the format:

---
status: proposed | accepted | deprecated | superseded
contact: author
date: YYYY-MM-DD
deciders: who decided
---