# High‑Level Architecture — **Stella Ops** (Consolidated • 2025Q4)

> **Purpose.** A complete, implementation‑ready map of Stella Ops: product vision, all runtime components, trust boundaries, tokens/licensing, control/data flows, storage, APIs, security, scale, DevOps, and verification logic.
> **Scope.** This file **replaces** the separate `components.md`; all component details now live here.

---

## 0) Product vision & principles

**Vision.** Stella Ops is a **deterministic SBOM + VEX platform** for CI/CD and runtime, tuned for **speed** (per‑layer deltas), **quiet output** (usage‑scoped views), and **verifiability** (DSSE + Rekor v2). It is **self‑hostable**, **air‑gap capable**, and **commercially enforceable**: only licensed installations can produce **Stella Ops‑verified** attestations.

**Operating principles.**

* **Scanner‑owned SBOMs.** We generate our own BOMs; we do not warehouse third‑party SBOM content (we can **link** to attested SBOMs).
* **Deterministic evidence.** Facts come from package DBs, installed metadata, linkers, and verified attestations; no fuzzy guessing in the core.
* **Per‑layer caching.** Cache fragments by **layer digest** and compose image SBOMs via **CycloneDX BOM‑Link** / **SPDX ExternalRef**.
* **Inventory vs Usage.** Always record the full **inventory** of what exists; separately present **usage** (entrypoint closure + loaded libs).
* **Backend decides.** PASS/FAIL is produced by **Policy** + **VEX** + **Advisories**. The scanner reports facts.
* **Attest or it didn’t happen.** Every export is signed as **in‑toto/DSSE** and logged in **Rekor v2**.
* **Sovereign‑ready.** Cloud is used only for licensing and optional endorsement; everything else is first‑party and self‑hostable.

---

## 1) Service topology & trust boundaries

### 1.1 Runtime inventory (first‑party)

| Service / Tool                  | Container image              | Core role                                                                                                                                             | Scale pattern                                      |
| ------------------------------- | ---------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- |
| **Scanner.WebService**          | `stellaops/scanner-web`      | Control plane for scans; catalog; SBOM composition (inventory & usage); diff; exports; **analysis‑only report runs** for Scheduler.                   | Stateless; N replicas behind LB.                   |
| **Scanner.Worker**              | `stellaops/scanner-worker`   | Runs analyzers (OS, Lang: Java/Node/Python/Go/.NET/Rust, Native ELF/PE/Mach‑O, EntryTrace); emits per‑layer SBOMs and composes image SBOMs.           | Horizontal; queue‑driven; sharded by layer digest. |
| **Scanner.Sbomer.BuildXPlugin** | `stellaops/sbom-indexer`     | BuildKit **generator** for build‑time SBOMs as OCI **referrers**.                                                                                     | CI‑side; ephemeral.                                |
| **Scanner.Sbomer.DockerImage**  | `stellaops/scanner-cli`      | CLI‑orchestrated scanner container for post‑build scans.                                                                                              | Local/CI; ephemeral.                               |
| **Concelier.WebService**        | `stellaops/concelier-web`    | Vulnerability ingest/normalize/merge/export (JSON + Trivy DB).                                                                                        | HA via Mongo locks.                                |
| **Excititor.WebService**        | `stellaops/excititor-web`    | VEX ingest/normalize/consensus; conflict retention; exports.                                                                                          | HA via Mongo locks.                                |
| **Policy Engine**               | (in `scanner-web`)           | YAML DSL evaluator (waivers, vendor preferences, KEV/EPSS, license, usage‑gating); produces **policy digest**.                                        | In‑process; cache per digest.                      |
| **Scheduler.WebService**        | `stellaops/scheduler-web`    | Schedules **re‑evaluation** runs; consumes Concelier/Excititor deltas; selects **impacted images** via BOM‑Index; orchestrates analysis‑only reports. | Stateless API.                                     |
| **Scheduler.Worker**            | `stellaops/scheduler-worker` | Executes selection and enqueues batches toward Scanner; enforces rate/limits and windows; maintains impact cursors.                                   | Horizontal; queue‑driven.                          |
| **Notify.WebService**           | `stellaops/notify-web`       | Rules engine for outbound notifications; manages channels, templates, throttle/digest logic.                                                          | Stateless API.                                     |
| **Notify.Worker**               | `stellaops/notify-worker`    | Delivers to Slack/Teams/Email/Webhooks; idempotent retries; digests.                                                                                  | Horizontal; per‑channel rate limits.               |
| **Signer**                      | `stellaops/signer`           | **Hard gate:** validates entitlement + release integrity; mints signing cert (Fulcio keyless) or uses KMS; signs DSSE.                                | Stateless; HPA by QPS.                             |
| **Attestor**                    | `stellaops/attestor`         | Posts DSSE bundles to **Rekor v2**; verification endpoints.                                                                                           | Stateless; HPA by QPS.                             |
| **Authority**                   | `stellaops/authority`        | On‑prem OIDC issuing **short‑lived OpToks** with DPoP/mTLS sender constraint.                                                                         | HA behind LB.                                      |
| **Zastava** (Runtime)           | `stellaops/zastava`          | Runtime inspector/enforcer (observer + optional Admission Webhook).                                                                                   | DaemonSet + Webhook.                               |
| **Web UI**                      | `stellaops/ui`               | Angular app for scans, diffs, policy, VEX, **Scheduler**, **Notify**, runtime, reports.                                                               | Stateless.                                         |
| **StellaOps.Cli**               | `stellaops/cli`              | CLI for init/scan/export/diff/policy/report/verify; Buildx helper; **schedule** and **notify** verbs.                                                 | Local/CI.                                          |

### 1.2 Third‑party (self‑hosted)

* **Fulcio** (Sigstore CA) — issues short‑lived signing certs (keyless).
* **Rekor v2** (tile‑backed transparency log).
* **RustFS** — offline-first object store with deterministic REST API (S3/MinIO fallback available for legacy installs).
* **MongoDB** — catalog, advisories, VEX, scheduler, notify.
* **Queue** — Redis Streams / NATS / RabbitMQ (pluggable).
* **OCI Registry** — must support **Referrers API** (discover SBOMs/signatures).

### 1.3 Cloud licensing (Stella Ops)

* **Licensing Service** (`www.stella-ops.org`) — issues long‑lived **License Tokens (LT)**; exchanges LT → **Proof‑of‑Entitlement (PoE)** bound to an installation key; revoke/introspect PoE; optional cross‑log **endorsement**.

### 1.4 Diagram (control/data planes & trust)

```mermaid
flowchart LR
  subgraph Cloud["www.stella-ops.org (Cloud)"]
    LS[Licensing Service<br/>LT→PoE / revoke / introspect]
  end

  subgraph OnPrem["Customer Site (Self-hosted)"]
    Auth[Authority (OIDC)\nOpTok (DPoP/mTLS)]
    SW[Scanner.WebService]
    WK[Scanner.Worker xN]
    CONC[Concelier]
    EXC[Excititor]
    SCHW[Scheduler.Web]
    SCH[Scheduler.Worker xN]
    NOTW[Notify.Web]
    NOT[Notify.Worker xN]
    POL[Policy Engine (in Scanner.Web)]
    SGN[Signer\n(entitlement + signing)]
    ATT[Attestor\n(Rekor v2 submit/verify)]
    UI[Web UI (Angular)]
    Z[Zastava\n(Runtime Inspector/Enforcer)]
    RFS[(RustFS object store)]
    MGO[(MongoDB)]
    QUE[(Queue/Streams)]
  end

  CLI[StellaOps.Cli / Buildx Plugin]
  REG[(OCI Registry with Referrers)]
  FUL[ Fulcio ]
  REK[ Rekor v2 (tiles) ]

  CLI -->|scan/build| SW
  SW -->|jobs| QUE
  QUE --> WK
  WK --> RFS
  SW --> MGO
  CONC --> MGO
  EXC --> MGO
  UI --> SW
  Z --> SW

  %% New event-driven loop
  CONC -- export.delta --> SCHW
  EXC  -- export.delta --> SCHW
  SCHW --> SCH
  SCH --> SW
  SW -- report.ready --> NOTW
  Z  -- admission/observe --> NOTW

  SGN <--> Auth
  SGN --> FUL
  SGN -->|mTLS| ATT
  ATT --> REK

  SGN <-->|verify referrers| REG
```

**Trust boundaries.** Only **Signer** can sign; only **Attestor** can write to **Rekor v2**. Scanner/UI/Scheduler/Notify never sign.

---

## 2) Licensing & tokens (installation‑ready, theft‑resistant)

**Two‑token model.**

* **License Token (LT)** — long‑lived JWT from **Licensing Service**; used **once** to enroll the installation; never used in hot path.
* **Proof‑of‑Entitlement (PoE)** — bound to the installation key (mTLS client cert **or** DPoP‑bound JWT with `cnf`); medium‑lived; renewable; revocable.
* **Operational token (OpTok)** — 2–5 min OIDC token from **Authority**, **sender‑constrained** (DPoP or mTLS). Used to authenticate to **Signer**/**Scanner.WebService**/**Scheduler.Web**/**Notify.Web**.

**Signer enforces both:** PoE proves entitlement; OpTok proves “who is calling now”. It also **independently verifies** the **scanner image digest** is **Stella Ops‑signed** via **Referrers + cosign** before signing anything.

**Enrollment sequence (LT → PoE).**

```plantuml
@startuml
actor Operator
participant "Install Agent" as IA
participant "Licensing Service" as LS
Operator -> IA: Provide LT
IA -> IA: Generate K_inst
IA -> LS: /license/enroll {LT, pub(K_inst)}
LS --> IA: PoE (mTLS client cert or JWT with cnf=K_inst), CRL/OCSP/introspect
@enduml
```

---

## 3) Scanner subsystem (facts engine)

### 3.1 Analyzers (deterministic only)

* **OS packages:** apk/dpkg/rpm (Linux); Windows MSI/SxS/GAC (M2).
* **Language (installed state):**

  * Java (pom.properties / MANIFEST) → `pkg:maven/...`
  * Node (`node_modules/*/package.json`) → `pkg:npm/...`
  * Python (`*.dist-info/METADATA`) → `pkg:pypi/...`
  * Go (buildinfo) → `pkg:golang/...`
  * .NET (`*.deps.json`) → `pkg:nuget/...`
  * **Rust:** deterministic **language markers** (symbol mangling) and crates only when present; otherwise `bin:{sha256}`.
* **Native:** ELF/PE/Mach‑O imports, DT_NEEDED, RPATH/RUNPATH, symbol versions, PE version info.
* **EntryTrace:** parse `ENTRYPOINT`/`CMD`; shell AST; resolve launchers (Java/Node/Python) to terminal program; record file:line chain.

### 3.2 Caching & composition

* **Layer cache:** `{layerDigest → SBOM fragment + analyzer meta}`.
* **File CAS:** `{sha256(file) → parse result (ELF/JAR metadata/etc.)}`.
* **Composition:** build **image SBOMs** from fragments via **BOM‑Link/ExternalRef**; emit **two views**:

  * **Inventory** (complete filesystem inventory).
  * **Usage** (entrypoint closure + linked libs).
* **Transport:** JSON **and** **CycloneDX Protobuf** (compact, fast to parse).
* **Index:** BOM‑Index sidecar with purl table + roaring bitmap + `usedByEntrypoint` flag for fast joins.

### 3.3 Diff (image → layer → package)

* Added / Removed / Version‑changed changes, **attributed** to the layer that caused them.
* Raw diffs preserved; backend view applies **VEX + Policy**.

### 3.4 Build‑time SBOMs (fast CI path)

* Buildx **generator** runs analyzers during `docker buildx build --attest=type=sbom,generator=stellaops/sbom-indexer`, attaches SBOMs as **OCI referrers**.
* Scanner.WebService can trust these (policy‑configurable) and **skip** re‑scan; DSSE + Rekor v2 can be done either at build time or post‑push via Signer/Attestor.

### 3.5 Events / integrations

* **Out:** `report.ready` (summary + verdict + Rekor UUID) → internal bus for **Notify** & UI.
* **Expose:** image‑level **BOM‑Index** metadata for **Scheduler** impact selection.

---

## 4) Backend evaluation (decider)

### 4.1 Concelier (advisories)

* Ingests vendor, distro, OSS feeds; normalizes & merges; persists canonical advisories in Mongo; exports **deterministic JSON** and **Trivy DB**.
* Offline kit bundles for air‑gapped sites.

### 4.2 Excititor (VEX)

* Ingests **OpenVEX / CSAF VEX / CycloneDX VEX**; normalizes claims; retains conflicts; computes **consensus** with provider trust weights and justification gates.

### 4.3 Policy Engine (YAML DSL)

* Matchers: `image/repo/env/purl/cve/vendor/source/path/layerDigest/usedByEntrypoint`
* Actions: `ignore(until, justification)`, `fail`, `warn`, `defer`, `requireVEX{vendors, justifications}`, `escalate {sev, KEV, EPSS}`, license constraints.
* Produces a **policy digest** (SHA‑256 of canonicalized policy).

### 4.4 PASS/FAIL flow

1. SBOM (Inventory / Usage) → join with **Concelier** advisories.
2. Apply **Excititor** consensus (statuses & justifications).
3. Apply **Policy**; compute PASS/FAIL with waiver TTLs.
4. Sign the **final report** (DSSE via **Signer**) and log to **Rekor v2** via **Attestor**.

---

## 5) Runtime enforcement (Zastava)

* **Observer:** inventories running containers, checks image signatures, SBOM presence (referrers), detects drift (entrypoint chain divergence), flags unapproved images.
* **Admission Webhook (optional):** blocks policy‑fail pods (dry‑run first).
* **Integration:** posts runtime events to Scanner.WebService; can request **delta scans** on changed layers.

---

## 6) Storage & catalogs (RustFS/Mongo)

**RustFS layout (default)**

```
rustfs://stellaops/
  layers/<sha256>/sbom.cdx.json.zst
  layers/<sha256>/sbom.spdx.json.zst
  images/<imgDigest>/inventory.cdx.pb
  images/<imgDigest>/usage.cdx.pb
  indexes/<imgDigest>/bom-index.bin
  attest/<artifactSha256>.dsse.json
```

**Catalog (Mongo)**

* `artifacts` (type/format/sha/size/rekor/ttl/immutable/refCount/createdAt)
* `images`, `layers`, `links`, `lifecycleRules`
* **Scheduler:** `schedules`, `runs`, `locks`, `impact_cursors`
* **Notify:** `rules`, `deliveries`, `channels`, `templates`

**Retention**

* RustFS applies retention via `X-RustFS-Retain-Seconds`; Scanner.WebService GC decrements `refCount` and deletes unreferenced metadata; S3/MinIO fallback retains native Object Lock when enabled.

---

## 7) APIs (consolidated surface)

### 7.1 Scanner.WebService

```
POST /api/scans                          { imageRef|digest, force? } → { scanId }
GET  /api/scans/{id}                     → { status, digests, artifacts[] }
GET  /api/sboms/{imageDigest}            ?format=cdx-json|cdx-pb|spdx-json&view=inventory|usage
GET  /api/diff?old=<digest>&new=<digest> → { added[], removed[], changed[], byLayer[] }
POST /api/exports                        { imageDigest, format, view } → { artifactId, rekorUrl }
POST /api/reports                        { imageDigest, policyRevision?, vexSnapshot? } → { reportId, verdict, rekorUrl }
GET  /api/catalog/artifacts/{id}         → { size, ttl, immutable, rekor, refs }
GET  /healthz | /readyz | /metrics
```

### 7.2 Signer (mTLS; hard gate)

```
POST /sign/dsse    # body: {subjectHash, imageDigest, predicate}; headers: OpTok (DPoP/mTLS) + PoE
GET  /verify/referrers?imageDigest=sha256:...  # is this image StellaOps-signed?
```

### 7.3 Attestor (mTLS)

```
POST /rekor/entries      # DSSE bundle → {uuid, index, proof, logURL}
GET  /rekor/entries/{uuid}
```

### 7.4 Authority (OIDC)

* `/.well-known/openid-configuration`, `/oauth/token` (DPoP/mTLS), `/oauth/introspect`, `/jwks`

### 7.5 Licensing (cloud)

```
POST /license/enroll      { LT, pubKey }           → PoE + introspection endpoints
POST /license/revoke      { license_id }           → ok
POST /license/introspect  { poe }                  → { active, claims, exp }
POST /attest/endorse      { bundle }               → endorsement bundle (optional)
```

### 7.6 Scheduler

```
POST /api/v1/scheduler/schedules         {yaml|json}      → { scheduleId }
GET  /api/v1/scheduler/schedules                          → [ { id, nextRun, status, stats } ]
POST /api/v1/scheduler/run               { id|selector }   → { runId }
GET  /api/v1/scheduler/runs/{id}                          → { status, counts, links }
GET  /api/v1/scheduler/cursor                            → { lastConcelierExportId, lastExcititorExportId }
```

### 7.7 Notify

```
POST /api/v1/notify/test                 { channel, target } → { delivered }
POST /api/v1/notify/rules                {yaml|json}         → { ruleId }
GET  /api/v1/notify/rules                                   → [ { id, match, actions, enabled } ]
GET  /api/v1/notify/deliveries                              → [ { id, eventId, channel, status, attempts } ]
```

---

## 8) Security & verifiability

* **Sender‑constrained tokens.** All operational calls use **DPoP** (RFC 9449) or **mTLS‑bound** tokens (RFC 8705).
* **Entitlement.** **PoE** is mandatory; revocation honored online.
* **Release integrity.** **Signer** independently verifies **scanner image digest** via **Referrers + cosign** before signing.
* **Separation of duties.** Scanner/UI/Scheduler/Notify cannot sign; only **Signer** can sign; only **Attestor** can write to **Rekor v2**.
* **Verifiers.** Anyone can verify: DSSE signature → certificate chain to **Stella Ops Fulcio/KMS root** → **Rekor v2** inclusion.
* **RBAC.** Roles: `scanner.admin|read`, `scheduler.admin|read`, `notify.admin|read`, `zastava.admin|read`.
* **Community vs Authorized.** Free/community runs throttled with no official attestations; authorized runs full speed and produce **Stella Ops‑verified** bundles.

**DSSE predicate (SBOM/report)**

```json
{
  "predicateType": "https://stella-ops.org/attestations/sbom/1",
  "subject": [{ "name": "s3://stellaops/images/<digest>/inventory.cdx.pb", "digest": { "sha256": "<sha256>" } }],
  "predicate": {
    "image_digest": "<sha256:...>",
    "stellaops_version": "2.3.1 (2027.04)",
    "license_id": "LIC-9F2A...",
    "customer_id": "CUST-ACME",
    "plan": "pro",
    "policy_digest": "sha256:...",
    "views": ["inventory","usage"],
    "created": "2025-10-17T12:34:56Z"
  }
}
```

**BOM‑Index sidecar**
Binary header + purl table + roaring bitmaps; optional `usedByEntrypoint` flags for fast policy joins.

---

## 9) Scale, performance & quotas

* **Workers:** horizontal; **distributed lock per layer digest**; global CAS in MinIO.
* **Queues:** Redis Streams / NATS / RabbitMQ. HPA by queue depth, CPU, memory.
* **Registry throttling:** per‑registry concurrency budgets.
* **Targets:**

  * Build‑time path P95 ≤ 3–5 s on warmed bases.
  * Post‑build delta scan P95 ≤ 10 s for 200 MB images.
  * Policy + VEX evaluation ≤ 500 ms for 5k components using BOM‑Index.
  * **Event → notification** p95 ≤ **30–60 s** under nominal load.
  * **Export delta → re‑evaluation verdict** p95 ≤ **5 min** for 10k impacted images.
* **Quotas:** license plan enforces QPS/concurrency/size; **Signer** throttles and can deny DSSE.

---

## 10) DevOps & distribution

* **Releases:** all first‑party images **cosign‑signed**; labels embed `org.stellaops.version` and `org.stellaops.release_date`.
* **Channels:**

  * **Community** (public registry): throttled, non‑attesting.
  * **Authorized** (private registry): full speed, DSSE enabled.
* **Client update flow:** containers self‑verify signatures at boot; report version; **Signer** enforces `valid_release_year` / `max_version` from PoE before signing.
* **Compose skeleton:**

```yaml
services:
  authority:       { image: stellaops/authority }
  fulcio:          { image: sigstore/fulcio }
  rekor:           { image: sigstore/rekor-v2 }
  minio:           { image: minio/minio, command: server /data --console-address ":9001" }
  mongo:           { image: mongo:7 }
  signer:          { image: stellaops/signer, depends_on: [authority, fulcio] }
  attestor:        { image: stellaops/attestor, depends_on: [rekor, signer] }
  scanner-web:     { image: stellaops/scanner-web, depends_on: [mongo, minio, signer, attestor] }
  scanner-worker:  { image: stellaops/scanner-worker, deploy: { replicas: 4 }, depends_on: [scanner-web] }
  concelier:       { image: stellaops/concelier-web, depends_on: [mongo] }
  excititor:       { image: stellaops/excititor-web, depends_on: [mongo] }
  scheduler-web:   { image: stellaops/scheduler-web, depends_on: [mongo] }
  scheduler-worker:{ image: stellaops/scheduler-worker, deploy: { replicas: 2 }, depends_on: [scheduler-web] }
  notify-web:      { image: stellaops/notify-web, depends_on: [mongo] }
  notify-worker:   { image: stellaops/notify-worker, deploy: { replicas: 2 }, depends_on: [notify-web] }
  ui:              { image: stellaops/ui, depends_on: [scanner-web, concelier, excititor, scheduler-web, notify-web] }
```

* **Backups:** Mongo dumps; RustFS snapshots (or S3 versioning when fallback driver is used); Rekor v2 DB snapshots; JWKS/Fulcio/KMS key rotation.
* **Ops runbooks:** Scheduler catch‑up after Concelier/Excititor recovery; connector key rotation (Slack/Teams/SMTP).
* **SLOs & alerts:** lag between Concelier/Excititor export and first rescan verdict; delivery failure rates by channel.

---

## 11) Observability & audit

* **Metrics:** scan latency, layer cache hit %, artifact bytes, DSSE/Rekor latency, policy evaluation time, queue depth, admission decisions (Zastava).
* **Scheduler metrics:** `scheduler.impacted_images_total`, `scheduler.jobs_enqueued_total`, `scheduler.selection_ms`, end‑to‑end p95 (event → verdict).
* **Notify metrics:** `notify.sent_total{channel}`, `notify.dropped_total{reason}`, `notify.digest_coalesced_total`, `notify.latency_ms`.
* **Tracing:** per‑stage spans; correlation IDs across Scanner→Signer→Attestor and Concelier/Excititor→Scheduler→Scanner→Notify.
* **Audit logs:** every signing records `license_id`, `image_digest`, `policy_digest`, and Rekor UUID; Scheduler records who scheduled what; Notify records where, when, and why messages were sent or deduped.
* **Compliance:** RustFS retention headers (or MinIO Object Lock when operating in S3 mode) keep immutable artifacts tamper‑resistant; reproducible outputs via policy digest + SBOM digest in predicate.

---

## 12) Roadmap (anchored to this architecture)

* M2: Windows MSI/SxS/GAC analyzers; deeper Rust (DWARF enrichers).
* M2: Buildx generator certified flows; cross‑registry trust policies.
* M3: Patch‑Presence plugin (signature‑based backport detection), opt‑in.
* M3: Zastava Admission control GA with policy presets and dry‑run→enforce stages.
* M3: **Scheduler GA** with export‑delta impact routing and capacity‑aware pacing.
* M3: **Notify GA** with digests, Slack/Teams/Email/Webhooks; **M4:** PagerDuty/Opsgenie connectors.
* Continuous: Policy UX (waiver TTLs, vendor rules), Excititor connectors expansion.

---

## 13) Canonical sequences (verification, re‑evaluation & notify)

**Sign & log (OpTok + PoE, image verify, DSSE, Rekor).**

```mermaid
sequenceDiagram
  autonumber
  participant Scan as Scanner.WebService
  participant Auth as Authority (OIDC)
  participant Sign as Signer
  participant Reg as OCI Registry
  participant Ful as Fulcio/KMS
  participant Att as Attestor
  participant Rek as Rekor v2

  Scan->>Auth: Get OpTok (DPoP/mTLS)
  Scan->>Sign: sign(request) + OpTok + PoE + DPoP proof
  Sign->>Auth: Validate OpTok & sender-constraint
  Sign->>Sign: Validate PoE (introspect/revocation)
  Sign->>Reg: Verify scanner image is StellaOps-signed (Referrers + cosign)
  alt OK
    Sign->>Ful: Get signing cert (keyless) or use KMS key
    Sign-->>Scan: DSSE bundle (cert chain)
    Scan->>Att: Submit bundle
    Att-->>Rek: Create entry
    Rek-->>Att: {uuid,index,proof}
    Att-->>Scan: Rekor URL
  else Deny
    Sign-->>Scan: 403 (no attestation)
  end
```

**Event‑driven re‑evaluation & notify.**

```mermaid
sequenceDiagram
  participant CONC as Concelier
  participant EXC as Excititor
  participant SCH as Scheduler
  participant SC as Scanner.WebService
  participant NO as Notify

  CONC->>SCH: export.delta {changedProductKeys, exportId}
  EXC ->>SCH: export.delta {changedProductKeys, exportId}
  SCH->>SCH: Impact select via BOM-Index bitmaps
  SCH->>SC: Enqueue analysis-only reports (batches)
  SC-->>SCH: verdict stream (PASS/FAIL, deltas)
  SCH->>NO: rescan.delta {imageDigest, newCriticals, links}
  NO-->>Slack/Teams/Email/Webhook: deliver (throttle/digest rules applied)
```

---

## 14) Minimal data shapes (Scheduler & Notify)

**Scheduler schedule (YAML via UI/CLI)**

```yaml
name: nightly-eu
when: "0 2 * * * Europe/Sofia"
mode: analysis-only        # or content-refresh
selection:
  scope: all-images        # or tenant/ns/repo label selectors
  onlyIf: { lastReportOlderThanDays: 7 }
notify:
  onNewFindings: true
  minSeverity: high
limits:
  maxJobs: 5000
  ratePerSecond: 50
```

**Notify rule (YAML)**

```yaml
name: high-critical-alerts
match:
  eventKinds: ["report.ready","rescan.delta","zastava.admission"]
  minSeverity: high
  namespaces: ["prod-*"]
  vex: { includeAcceptedJustifications: false }
actions:
  - channel: slack
    target: "#sec-alerts"
    template: "concise"
    throttle: "5m"
  - channel: email
    target: "soc@acme.org"
    digest: "hourly"
enabled: true
```