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Change Events Prep — PREP-POLICY-ENGINE-30-003-CHANGE-EVENTS-DEPEN

Status: Draft (2025-11-20) Owners: Policy Guild · Scheduler Guild · Cartographer Guild Scope: Define the change-event payload and scheduling expectations following simulation bridge (30-002).

Dependencies

  • Simulation bridge output schema (30-002).
  • Scheduler delivery channel (NATS/Redis) subject names and dedupe policy.

Draft event envelope

  • event_type: policy.overlay.change
  • Fields: tenant_id, overlay_hash, policy_profile_hash, simulation_id?, changes[] (array of {component_purl, advisory_id, prev_status, new_status, severity_delta?, trace_ref}), occurred_at (UTC), event_id (deterministic ID = hash of overlay_hash + timestamp).
  • Transport: propose NATS subject policy.overlay.change with durable stream; idempotency key = event_id.
  • Observability: counter policy_overlay_change_total{tenant,result}; log template includes overlay_hash, event_id, change_count.

Acceptance to close PREP

  • Subject/stream names confirmed with Scheduler.
  • JSON schema stub saved at docs/modules/policy/schemas/policy-overlay-change@draft.json.
  • Sample event at docs/modules/policy/samples/policy-overlay-change@draft.json.

Handoff

This document serves as the prep artefact for PREP-POLICY-ENGINE-30-003-CHANGE-EVENTS-DEPEN. Update once 30-002 finalizes schema/subject; then unblock the implementation task.