{
  "schema": "varexis-public-evidence-record/0.3",
  "generated_at_utc": "2026-10-16T12:55:40.483Z",
  "record_id": "VXI-EXT-PROCUREMENT-PUBSUB-EXACTLY-ONCE-01-v1",
  "record_kind": "external_reference",
  "title": "Pub/Sub exactly-once: Acknowledgement and regional scope",
  "system": "Google Cloud Pub/Sub",
  "evidence_family": "vendor_evidence_review",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Does Pub/Sub exactly-once delivery cover every subscription and external action?",
  "near_questions": [
    "Does Pub/Sub exactly-once support push subscriptions?",
    "Which cloud region contains subscribers?",
    "Was acknowledgement actually successful?",
    "What happens after an acknowledgement deadline expires?",
    "Can an old acknowledgement ID fail?",
    "Are separate publishes the same message?",
    "Does delivery guarantee an external database commit?",
    "Can subscriber progress be recovered after a crash?",
    "Is the feature enabled on this subscription?",
    "What evidence links processing to acknowledgement?",
    "Which claims remain outside the delivery guarantee?",
    "Can I save the reviewed exactly-once scope?"
  ],
  "supported_claims": [
    {
      "claim": "The documented feature applies to pull subscriptions within a cloud region. Successful acknowledgement prevents redelivery of that message, while expired acknowledgement deadlines can lead to a new valid delivery. It does not establish an atomic transaction with an external business system or deduplicate separate publisher messages.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
    "Verified buyer configuration or effective access rights",
    "Independent execution, completeness or security testing",
    "Vendor certification, legal compliance or guaranteed suitability"
  ],
  "public_summary": "The documented feature applies to pull subscriptions within a cloud region. Successful acknowledgement prevents redelivery of that message, while expired acknowledgement deadlines can lead to a new valid delivery. It does not establish an atomic transaction with an external business system or deduplicate separate publisher messages.",
  "related_record_ids": [],
  "source_review": {
    "source_type": "official_external_documentation",
    "source_title": "Pub/Sub exactly-once delivery",
    "source_url": "https://docs.cloud.google.com/pubsub/docs/exactly-once-delivery",
    "checked_on": "2026-10-16",
    "candidate_record_id": "VXI-EXT-PROCUREMENT-PUBSUB-EXACTLY-ONCE-01-v1",
    "candidate_record_sha256": "c53ab34dc55228cc20298e163acd43d2021fead66d76d9e5f9217ff95ce3a6c2",
    "method": "Primary documentation reviewed for the published bounded statement.",
    "deployment_tested_by_varexis": false,
    "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": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "The documented feature applies to pull subscriptions within a cloud region. Successful acknowledgement prevents redelivery of that message, while expired acknowledgement deadlines can lead to a new valid delivery. It does not establish an atomic transaction with an external business system or deduplicate separate publisher messages.",
    "required_buyer_context": "Subscription mode, region, acknowledgement handling, publisher IDs and downstream transaction. Effective configuration and dated operational evidence have not been 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",
    "review_status": "documentation_review_only",
    "checked_on": "2026-10-16",
    "claim_to_check": "Exactly-once delivery guarantees every business effect happens once globally.",
    "documented_statement": {
      "status": "documented",
      "statement": "The documented feature applies to pull subscriptions within a cloud region. Successful acknowledgement prevents redelivery of that message, while expired acknowledgement deadlines can lead to a new valid delivery. It does not establish an atomic transaction with an external business system or deduplicate separate publisher messages.",
      "source_ids": [
        "pubsub"
      ]
    },
    "buyer_evidence_required": [
      "Subscription type and feature enablement.",
      "Subscriber region and acknowledgement results.",
      "Publisher identity and downstream commit handling."
    ],
    "review_condition": {
      "status": "varexis_review_policy",
      "statement": "Require the regional, subscription and business-transaction scope before accepting an exactly-once claim."
    },
    "unknowns": "The buyer configuration, contract, effective entitlement and operational evidence have not been inspected. Missing evidence does not establish absence or failure of the feature.",
    "evidence_sources": [
      {
        "source_id": "pubsub",
        "url": "https://docs.cloud.google.com/pubsub/docs/exactly-once-delivery",
        "final_url": "https://docs.cloud.google.com/pubsub/docs/exactly-once-delivery",
        "title": "Pub/Sub exactly-once delivery",
        "checked_on": "2026-10-16",
        "sha256": "7e35a9e733047a095d518189b29bcadce1f161ca4eebbbfe76e081e888942049",
        "bytes": 278593
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Procurement evidence support only; no supplier clearance, legal conclusion, configuration audit or verification of the buyer's claim is supplied.",
    "paid_value": {
      "decision_context": "Preserve the precise delivery guarantee and excluded business effects for supplier evaluation.",
      "free": "Complete review, practical questions, sources and limitations; may be saved locally.",
      "single_request": "Existing server-saved version-bound route snapshot for later authenticated retrieval.",
      "evidence_receipt": "The same snapshot plus the existing unsigned delivery receipt.",
      "excluded": [
        "Fresh vendor research",
        "Continuous monitoring or change alerts",
        "Testing the buyer configuration",
        "Private evidence or vendor certification"
      ],
      "integrity": "Hashes identify content versions; they do not prove truth or provide a signature."
    },
    "revalidation": {
      "trigger": "A saved purchase does not recheck the source or buyer configuration.",
      "specific_watch": "Subscription mode, region, acknowledgement handling, publisher IDs and downstream transaction."
    }
  },
  "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",
    "payment_required": true,
    "availability_endpoint": "/api/index/capabilities",
    "operational_status": "AUTOMATIC_SERVICE_CAPABILITIES_GATED",
    "checkout_url": "/index-access"
  },
  "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-exactly-once-ack-region-boundary",
  "machine_readable_record": "/varexis-index/records/pubsub-exactly-once-ack-region-boundary.json"
}