03-observability-model.md

Observability Model

Observability is protocol-owned data, not leftover logs.

The baseline distinguishes:

• RouterDecision for explainable selection outcomes,
• TraceEvent and TraceSpan for execution-path timing and fallback detail,
• UsageEvent for request/accounting outcomes,
• ObservedPerformanceProfile for measured endpoint behavior over time.

The lightweight host writes artifacts to a documented runtime output path so later dashboards can build leaderboards, regression views, cost/latency comparisons, and failure-trend analysis without changing the core data model.