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Graph Overlay System (Policy, VEX, Reachability)

Module

Graph

Status

VERIFIED

Description

Overlay system with exporter, in-memory overlay service, and tests for layering policy/VEX/reachability data onto dependency graphs.

Implementation Details

  • Overlay service interface: src/Graph/StellaOps.Graph.Api/Services/IOverlayService.cs -- overlay query contract
  • In-memory overlay service: src/Graph/StellaOps.Graph.Api/Services/InMemoryOverlayService.cs -- in-memory overlay implementation for testing
  • Overlay exporter: src/Graph/StellaOps.Graph.Indexer/Analytics/GraphOverlayExporter.cs -- exports analytics results as overlay layers
  • Policy overlay processor: src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlayProcessor.cs -- ingests policy decisions as graph overlays
  • Policy overlay transformer: src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlayTransformer.cs -- transforms policy data for graph overlay
  • Policy overlay snapshot: src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlaySnapshot.cs -- policy overlay state
  • Policy overlay metrics: src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlayMetrics.cs, IPolicyOverlayMetrics.cs -- overlay processing metrics
  • VEX overlay: src/Graph/StellaOps.Graph.Indexer/Ingestion/Vex/VexOverlayTransformer.cs, VexOverlaySnapshot.cs -- VEX verdict overlays on graph
  • Reachability delta: src/Graph/StellaOps.Graph.Api/Services/IReachabilityDeltaService.cs, InMemoryReachabilityDeltaService.cs -- reachability annotation overlays
  • Tests: src/Graph/__Tests/StellaOps.Graph.Indexer.Tests/GraphOverlayExporterTests.cs
  • Metrics tests: src/Graph/__Tests/StellaOps.Graph.Api.Tests/MetricsTests.cs -- overlay cache counter verification
  • Source: Feature matrix scan

E2E Test Plan

  • Verify policy overlay renders policy decisions on graph nodes
  • Test VEX overlay annotates graph with VEX verdict data
  • Verify reachability overlay shows reachability status per edge
  • Test overlay exporter generates valid overlay from analytics results
  • Verify overlay stacking (multiple overlays on same graph)

Verification

  • Run ID: run-002
  • Date: 2026-02-09T21:43:00Z
  • Tier: 1 (Source + Build + Test)
  • Result: PASS
  • Evidence: 52/52 Graph.Api.Tests pass (including MetricsTests 2/2 pass for overlay cache counters). 108/108 non-persistence tests pass across all Graph test projects. 17 Persistence tests skipped (require Docker/PostgreSQL -- environment limitation, not a regression).
  • Notes: Required 1 retry cycle. Initial failure due to MeterListener cross-contamination in MetricsTests -- name-based meter filtering picked up instruments from other tests' undisposed GraphMetrics instances. Fixed in run-002 by switching to instance-based meter filtering and adding using statements to GraphMetrics instances in QueryServiceTests.