{
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  "record_id": "VXI-EXT-ICE07-PUBSUB-DEADLETTER-WRAPPER-ORIGINAL-IDENTITY-01-v1",
  "record_kind": "external_reference",
  "title": "Does Pub/Sub dead-letter forwarding preserve the original envelope unchanged",
  "system": "Google Cloud",
  "evidence_family": "vendor_evidence_review",
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  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Does Pub/Sub dead-letter forwarding preserve the original envelope unchanged?",
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    "How do I trace its original subscription?",
    "Which identities must survive failure handling?",
    "Can the new envelope alone identify the original attempt?"
  ],
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    {
      "claim": "Pub/Sub wraps an undeliverable message in a new message and adds attributes identifying the source subscription before forwarding it.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "Do not discard original-message and source-subscription context during reconstruction.",
    "Buyer implementation, live runtime enforcement, settled payment, verified deletion or certification are not established.",
    "No expanded capabilities or licences for existing INDEX executables."
  ],
  "public_summary": "Pub/Sub wraps an undeliverable message in a new message and adds attributes identifying the source subscription before forwarding it.",
  "related_record_ids": [],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "Dead-letter topics  |  Pub/Sub  |  Google Cloud Documentation",
    "source_url": "https://docs.cloud.google.com/pubsub/docs/dead-letter-topics",
    "checked_on": "2026-10-29",
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    "revalidation": "The delivered snapshot preserves the review date shown. Recheck current primary documentation and deployment context before relying on present applicability; payment does not trigger fresh research."
  },
  "answer_policy": {
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    "bounded_answer": "Pub/Sub wraps an undeliverable message in a new message and adds attributes identifying the source subscription before forwarding it.",
    "required_buyer_context": "forwarded envelope; wrapped original message; source subscription; processing references. Buyer deployment not inspected.",
    "missing_evidence": "A broader claim needs evidence matching the intended use. Payment does not upgrade the evidence state."
  },
  "private_boundary": "Raw logs, thresholds, private paths, source code, protected mechanisms and reconstruction-level details are excluded from public and paid delivery.",
  "decision_profile": {
    "schema": "varexis-vendor-evidence-review/1",
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    "checked_on": "2026-10-29",
    "claim_to_check": "Does Pub/Sub dead-letter forwarding preserve the original envelope unchanged?",
    "documented_statement": {
      "status": "documented",
      "statement": "Pub/Sub wraps an undeliverable message in a new message and adds attributes identifying the source subscription before forwarding it.",
      "source_ids": [
        "pubsub-deadletter"
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    },
    "review_inference": {
      "status": "review_inference",
      "statement": "Join failure records to original workflow attempts. Require the missing evidence before accepting, retrying or closing the operation. Wrapper provenance is distinct from ordering-key redelivery. This is an operational review inference, not an observed deployment outcome.",
      "source_ids": [
        "pubsub-deadletter"
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      "forwarded envelope",
      "wrapped original message",
      "source subscription",
      "processing references"
    ],
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      "status": "varexis_review_policy",
      "statement": "Do not discard original-message and source-subscription context during reconstruction."
    },
    "unknowns": "The buyer implementation, effective authority, source-data completeness and actual business outcomes were not inspected.",
    "unknown_finding": {
      "status": "unknown",
      "statement": "No buyer deployment or transaction was observed."
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        "source_id": "pubsub-deadletter",
        "url": "https://docs.cloud.google.com/pubsub/docs/dead-letter-topics",
        "final_url": "https://docs.cloud.google.com/pubsub/docs/dead-letter-topics",
        "captured_at_utc": "2026-10-29T22:17:23.990983+00:00",
        "status": 200,
        "content_type": "text/html; charset=utf-8",
        "bytes": 663763,
        "sha256": "62302eceb2608c1c26384fc97bb595e75cd2d227044887067fce8b131e3118b1",
        "publisher": "Google Cloud",
        "title": "Dead-letter topics  |  Pub/Sub  |  Google Cloud Documentation",
        "version_context": "Rolling official documentation snapshot; consult current service and client version before reliance",
        "rights_disposition": "Original bounded paraphrase with source attribution. Captured source body remains private; no source-body redistribution. Vendor documentation rights retained; no trademark or code licence conveyed.",
        "checked_on": "2026-10-29",
        "capture_status": 200,
        "claim_review_completed": true,
        "hash_basis": "SHA-256 of captured HTTP response body bytes",
        "reviewed_sections": [
          "How maximum delivery attempts are calculated",
          "How dead-letter topics work"
        ]
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Documentation supports only the stated boundary. Existing licensed checkers analyse supported supplied declarations locally; they do not inspect provider accounts, verify live behaviour, enforce decisions or certify compliance.",
    "paid_value": {
      "decision_context": "Join failure records to original workflow attempts. Require the missing evidence before accepting, retrying or closing the operation.",
      "free": "Complete source review, questions, provenance and limitations; free to read and save locally.",
      "single_request": "Unavailable for this publication-only record; historical saved retrieval is unchanged.",
      "evidence_receipt": "Unavailable for this publication-only record; no paid retrieval entitlement is added.",
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        "Native provider integration or schema support",
        "Live inspection or runtime enforcement",
        "Payment settlement or verified deletion",
        "Certification or expanded licences"
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      "trigger": "Recheck current primary documentation and the applicable API, service, account and configuration before reliance. No ongoing monitoring is included.",
      "specific_watch": "How dead-letter topics work"
    },
    "buyer_relevance": "Join failure records to original workflow attempts. Require the missing evidence before accepting, retrying or closing the operation.",
    "refusal_conditions": [
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      "operator": "Workflow operator or incident reviewer",
      "scenario": "Join failure records to original workflow attempts.",
      "consequence": "Require the missing evidence before accepting, retrying or closing the operation.",
      "confidence": "High for captured documentation; buyer applicability and deployed behaviour unverified."
    },
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        "licence_scope": "Existing separate internal-use licence; subscriptions do not include the executable.",
        "benefit": "Optional local analysis of supported supplied declarations only; no native provider integration or verification is added."
      },
      "boundary": "Optional Audit Coverage only reconciles supported declared event chains and completeness. It does not connect to these services, verify signatures, inspect queues, execute recovery or approve software."
    },
    "exact_access": {
      "endpoint": "/mcp/catalogue",
      "tool": "get_publication_record",
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      "paid_saved_retrieval": false
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    "label": "Audit, Provenance & Evidence Accountability",
    "classification_id": "audit",
    "classification_label": "Audit, Provenance & Evidence Accountability",
    "topic_id": "audit",
    "buyer_intent": "Join failure records to original workflow attempts. Require the missing evidence before accepting, retrying or closing the operation.",
    "comparison_role": "supplementary_discovery"
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  "paid_access_note": "The full published answer and boundaries are free. Paid access saves the selected route and source versions, with an unsigned receipt when purchased. Preview coverage before paying. Fresh research, bespoke assessment and protected evidence are excluded.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "single_request",
    "service_routes_url": "/varexis-index/service-routes.json",
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    "availability_endpoint": "/api/index/capabilities",
    "operational_status": "AUTOMATIC_SERVICE_CAPABILITIES_GATED",
    "checkout_url": "/index-access"
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  "authority_boundary": "VAREXIS-INDEX informs evidence reliance. It does not provide advice, certification, deployment authority, security assurance, production approval, or guarantee.",
  "human_page": "/varexis-index/catalog.html#pubsub-deadletter-wrapper-original-identity",
  "machine_readable_record": "/varexis-index/records/pubsub-deadletter-wrapper-original-identity.json"
}