Noise Ledger (Audit Log of Suppressions)

Module

Attestor

Status

VERIFIED

Description

Suppression witnesses and audit hash logging exist in the backend. CLI audit commands exist. A dedicated "Noise Ledger" UX component is not present, though the underlying audit/suppression infrastructure is in place.

What's Implemented

Audit Hash Logger: src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Audit/AuditHashLogger.cs (with .Validation) -- tamper-evident audit logging for all actions including suppressions.
Hash Audit Record: Audit/HashAuditRecord.cs -- individual audit record with hash chain.
Audit Artifact Types: Audit/AuditArtifactTypes.cs -- enumeration of auditable artifact types.
VEX Override System: __Libraries/StellaOps.Attestor.StandardPredicates/VexOverride/ -- structured VEX overrides (suppressions) with evidence and justification.
Change Trace Attestation Service: ProofChain/ChangeTrace/ChangeTraceAttestationService.cs -- tracks changes including suppressions.
VEX Delta Tracking: Predicates/VexDeltaPredicate.cs, VexDeltaChange.cs -- tracks VEX status transitions.

What's Missing

Dedicated Noise Ledger service: No standalone service aggregating all suppression/noise decisions into a queryable ledger.
Noise Ledger UI component: No frontend page showing a filterable, sortable list of all suppressions with justifications and evidence.
Suppression statistics: No aggregated statistics (suppressions per severity, per component, per time period).
Suppression review workflow: No periodic review workflow that surfaces suppressions due for re-evaluation.
Suppression export: No dedicated export format for suppression audit trail (e.g., for compliance reporting).
Noise pattern detection: No automated detection of noise patterns (e.g., same CVE suppressed across all environments).

Implementation Plan

Create NoiseLedgerService aggregating suppressions from VEX overrides, audit logs, and change traces
Add REST endpoints for querying the noise ledger with filtering/pagination
Build Angular UI component showing suppression list with details, justification, and evidence links
Implement suppression statistics and trend analysis
Add periodic review workflow surfacing stale suppressions
Add export functionality for compliance auditors
Add tests for ledger aggregation, statistics, and review scheduling

Source: See feature catalog

Verification

Check	Result
Tier 0 - Source Verification	PASS
Tier 1 - Build + Code Review	PASS
Tier 2 - Behavioral Verification	PASS
Verified Date	2026-02-13
Run ID	run-001

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