# Graph Indexer packaging (Runtime & Signals 140.A)

## Deployment overlays
- Helm/Compose should expose two timers for analytics: `GRAPH_ANALYTICS_CLUSTER_INTERVAL` and `GRAPH_ANALYTICS_CENTRALITY_INTERVAL` (ISO-8601 duration, default 5m). Map to `GraphAnalyticsOptions`.
- Change-stream/backfill worker toggles via `GRAPH_CHANGE_POLL_INTERVAL`, `GRAPH_BACKFILL_INTERVAL`, `GRAPH_CHANGE_MAX_RETRIES`, `GRAPH_CHANGE_RETRY_BACKOFF`.
- Mongo bindings (optional): `GRAPH_CHANGE_COLLECTION`, `GRAPH_CHANGE_SEQUENCE_FIELD`, `GRAPH_CHANGE_NODE_FIELD`, `GRAPH_CHANGE_EDGE_FIELD`, `GRAPH_CHANGE_IDEMPOTENCY_COLLECTION`, `GRAPH_ANALYTICS_SNAPSHOT_COLLECTION`, `GRAPH_ANALYTICS_PROGRESS_COLLECTION`.
- New Mongo collections:
  - `graph_cluster_overlays` — cluster assignments (`tenant`, `snapshot_id`, `node_id`, `cluster_id`, `generated_at`).
  - `graph_centrality_overlays` — degree + betweenness approximations per node.
  - optional node updates write `attributes.cluster_id` when `WriteClusterAssignmentsToNodes=true`.

## Offline kit alignment
- Cluster/centrality overlays are exportable alongside `nodes.jsonl`/`edges.jsonl`; keep under `artifacts/graph-snapshots/{snapshotId}/overlays/` for air-gapped imports.
- Seed bundle layout:
  - `clusters.ndjson` — overlay records (one per node) matching `graph_cluster_overlays` schema.
  - `centrality.ndjson` — overlay records with `degree`/`betweenness`.
  - `manifest.json` — references snapshot manifest hash and run timestamps.
- Determinism: overlays ordered by `node_id` (ordinal) to keep bundle hashes stable.

## Observability hooks
- Metrics (Meter `StellaOps.Graph.Indexer`):
  - `graph_analytics_runs_total`, `graph_analytics_failures_total`, `graph_analytics_duration_seconds`, `graph_analytics_clusters_total`, `graph_analytics_centrality_total`.
  - `graph_changes_total`, `graph_backfill_total`, `graph_change_failures_total`, `graph_change_lag_seconds`.
- Recommended alerts: lag > 5m, failures > 0 over 10m window, cluster job duration > 2m.

## Configuration defaults
- Cluster/centrality intervals: 5 minutes; label-propagation iterations: 6; betweenness sample size: 12.
- Change stream: poll every 5s, backfill every 15m, max retries 3 with 3s backoff, batch size 256.
- Overlay exports: clusters/centrality written to `overlays/clusters.ndjson` and `overlays/centrality.ndjson` with manifest; ordered by `node_id` for deterministic bundle hashes.

## Notes
- Analytics writes are idempotent (upserts keyed on tenant+snapshot+node_id). Change-stream processing is idempotent via sequence tokens persisted in `IIdempotencyStore` (Mongo or in-memory for tests).
- Keep Helm/Compose values in sync with these defaults when publishing the Runtime & Signals 140.A bundle.