# OAC — OBSERVABILITY & AUDIT CANON version: v1.0 status: ACTIVE parent: master_architecture_index.md phase: 07 phase_name: Observability & Audit Canon document_role: observability_and_audit_standard --- ## 1. OBJECTIVE Define how Devon observes, logs, traces and audits all operations. --- ## 2. CORE PRINCIPLE Nothing in Devon can exist without visibility. --- ## 3. OBSERVABILITY MODEL ### 3.1 Metrics - latency - throughput - error rate - module health ### 3.2 Logs - structured logs - persistent logs - queryable logs ### 3.3 Traces - full request path - module-to-module tracking - propagation visibility --- ## 4. REQUEST TRACE RULE Every request must: - have a unique ID - propagate across all modules - be traceable end-to-end --- ## 5. AUDIT MODEL ### 5.1 Audit Records - input - decision - validation result - execution action - output ### 5.2 Audit Storage - persistent - immutable - linked to request ID --- ## 6. VALIDATION TRACE - every validation must be recorded - PASS / FAIL / MISSING must be auditable --- ## 6.1 AUDIT SURFACE BOUNDARY Observability and audit evidence may be summarized in documentation surfaces, but runtime audit authority belongs to the operational surface. Operator Panel responsibilities: - expose runtime audit evidence - expose health, telemetry, traces and validation state - expose materially observable PASS / FAIL / MISSING Documentation Hub responsibilities: - expose the canonical audit model - expose what runtime evidence is expected to exist - expose documentation completion and category coverage - never replace real operational audit --- ## 7. FAILURE VISIBILITY - failures must be logged - failures must include cause - failures must include origin module - distribution failures must be visible - packaging failures must be visible - execution failure alone is not sufficient observability --- ## 8. MODULE VISIBILITY Every module must expose: - identity - health status - activity logs - trace participation - distribution-related failure visibility when applicable --- ## 9. ALERTING - critical failures must trigger alerts - abnormal patterns must be flagged - alerts must be actionable - distribution and packaging failures must be alertable --- ## 10. GLOBAL LAW If it cannot be observed, it is MISSING.