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adr-pure-functional-health-evaluation

Decision

Adopt and institutionalize Pure Functional Health Evaluation as a core pattern for deterministic, side-effect-free health and compliance scoring across systems.

Context

  • Source: governance-flow
  • Pattern: pure-functional-health-evaluation
  • Promotion Recommendation: recommendation-pure-functional-health-evaluation
  • Scope Classification: global
  • Scope Classification Artifact: pattern-scope-classification

Health assessment algorithms and dashboard reporting required reproducible evaluation without coupling to external databases, filesystems, or network I/O, ensuring consistent diagnostic derivation across continuous governance workflows.

Scope

Applicability: All health scoring components, compliance evaluation engines, and automated CI gates within the CAS platform and client repositories.

Global pattern applicability across continuous architecture health assessment and reporting workflows.

Consequences

Governance

Guarantees reproducible audit trails and unambiguous diagnostic explanations across all automated governance verification gates.

Execution

Removes external I/O overhead from health derivation pipelines, enabling rapid execution in CI/CD and offline unit testing suites.

System Behaviour

Health scoring produces deterministic status classifications and human-readable diagnostic reasons strictly bounded by input metric structures.

Evidence Summary

Promotion Evidence

Implemented cleanly in src/cas_runner/dashboard/health_model.py, active verification across CI flows, and pure diagnostic reasoning without side effects.

Promotion Criteria

Satisfied all criteria including significance, reusability, recurrence, evidence quality, governance maturity, and strategic alignment.

Governance Risks

Potential metric skew if upstream telemetry input schemas drift without corresponding rule updates.

Traceability

Pattern Proposal

pure-functional-health-evaluation

Scope Classification

Artifact: pattern-scope-classification

Classification: global

Promotion Recommendation

recommendation-pure-functional-health-evaluation

Promotion Decision

promotion-decision-pure-functional-health-evaluation

Next Step

  • Submit ADR to Architecture Forum for formal institutionalisation
  • Generate global pattern record in knowledge/global/patterns/