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# Findings Ledger Prep — 29-008, 34-101, AIRGAP-56-001
Status: **Ready for implementation** (2025-11-22)
Owners: Findings Ledger Guild · Observability Guild · AirGap Time Guild · Orchestrator Guild
Scope: Provide the missing contracts needed to unblock LEDGER-29-008 load/replay, LEDGER-34-101 orchestrator export linkage, and LEDGER-AIRGAP-56-001 bundle provenance recording.
## Observability (LEDGER-29-008)
- Metrics schema locked:
- `ledger_projection_lag_seconds{tenant}` (gauge)
- `ledger_write_duration_seconds_bucket` (histogram)
- `ledger_events_total{tenant,kind}` (counter)
- Alert: burn-rate 4xx/5xx on ingestion path >2% over 5m/1h.
- Log fields: `tenantId`, `requestId`, `projectionCheckpoint`, `bundleId?`, `attestationId?`, `operation`.
- Trace spans: `ledger.write`, `ledger.replay`, `ledger.restore` with baggage `tenant-id`, `bundle-id`.
## Orchestrator export linkage (LEDGER-34-101)
- Export payload shape (from Orchestrator Sprint 150.A):
- `runId` (uuid), `jobType`, `artifactHash`, `policyHash`, `startedAt`, `completedAt`, `status`, `manifestPath`, `logsPath`.
- Ledger integration rule: store export rows under collection `orchestrator_exports` with index `(artifactHash, runId)`; anchor Merkle root into ledger timeline entry `ledger_export` referencing above fields.
## AirGap provenance (LEDGER-AIRGAP-56-001)
- Mirror bundle contract alignment:
- fields recorded per import: `bundleId`, `mirrorGeneration`, `merkleRoot`, `timeAnchor`, `publisher`, `hashAlgorithm`, `contents[]` (sha256 of NDJSON segments).
- determinism: imports sorted by `bundleId`; all timestamps UTC.
- API for recording import: `POST /internal/ledger/airgap-import` with payload above; respond 202 + `ledgerEntryId`.
## Acceptance Criteria
- Metrics/log/logging names frozen as above and added to `docs/modules/findings-ledger/observability.md` in next implementation step.
- Orchestrator export payload shape referenced by both Ledger and Orchestrator tasks; no missing fields for audit.
- AirGap import payload is deterministic and replays without external network requirements.
## Notes
- Satisfies PREP-LEDGER-29-008-AWAIT-OBSERVABILITY-SCHEMA, PREP-LEDGER-34-101-ORCHESTRATOR-LEDGER-EXPORT, and PREP-LEDGER-AIRGAP-56-001-MIRROR-BUNDLE-SCHEM.