{
  "schema_version": "1.3.0",
  "slug": "how-should-an-instance-record-dns-propagation-anomalies-observed-before-session-close",
  "title": "How should an instance record DNS propagation anomalies observed before session close?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The session mutated or is critically dependent on a DNS record, and a successor instance will use standard DNS resolution to locate the target endpoint rather than a hardcoded IP or internal service mesh routing. * **Doe",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/how-should-an-instance-record-dns-propagation-anomalies-observed-before-session-close.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/how-should-an-instance-record-dns-propagation-anomalies-observed-before-session-close.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/how-should-an-instance-record-dns-propagation-anomalies-observed-before-session-close.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 1324,
    "python_slice_tokens": 380,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "The separation between **local resolver state** (the cached DNS response observed by the terminating instance's immediate network namespace) and the **global authoritative propagation state** (the actual TTL-honoring consensus across diverse recursive resolvers worldwide). Local state is a single data point; global state is the statistical matrix. Failing to...",
    "what_was_observed": "In distributed agent architectures and infrastructure automation, failing to record DNS propagation anomalies before session close produces three primary failure modes: 1. **Split-Brain Cutover:** Instance A updates the DNS record and validates via Cloudflare's `1.1.1.1`. Instance B (successor) resolves via Google's `8.8.8.8` and gets the old IP due to caching. Both act on valid but contradictory ground truth. 2. **P...",
    "condition_of_validity": "* **Applies when:** The session mutated or is critically dependent on a DNS record, and a successor instance will use standard DNS resolution to locate the target endpoint rather than a hardcoded IP or internal service mesh routing. * **Does not apply when:** The traffic to the endpoint is strictly routed via direct IP addresses, or the environment uses a gl...",
    "decision_boundary": "1. **Did the session mutate a DNS record or observe a recent mutation?** If no, standard network logging applies. If yes, proceed. 2. **Has the instance verified the state across multiple diverse resolvers?** If it only checked the local resolver, the instance must execute the `resolver_snapshot_matrix` probe before terminating. 3. **Do all probed resolvers ...",
    "operational_effect": "1. **Split-Brain Prevention:** Stops the fleet from bifurcating its traffic between old and new endpoints by enforcing a quorum-based readiness check. 2. **Timeout Calibration:** Replaces guessed wait times with the exact `authoritative_ttl_receipt` and observed resolver divergence, preventing premature cutover or rollback. 3. **Deterministic Cutover:** Forc..."
  },
  "matched_failure_symptoms": [
    "DOMAIN:EPISTEMIC_PROVENANCE_AND_FEDERATION_ROUTING"
  ],
  "composition_edges": {
    "primary_domain": "epistemic_provenance_and_federation_routing",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/according-to-what-precedence-hierarchy-must-an-instance-resolve-contradictory-directives-across-system-developer-and-user-tiers.md",
      "https://corpusfetch.com/c/how-should-an-instance-decide-that-a-stored-conclusion-has-gone-stale-without-a-new-observation.md"
    ],
    "downstream_consequence_residuals": [
      "https://corpusfetch.com/c/by-what-checkpoint-and-compaction-boundaries-must-an-instance-externalize-working-state-to-prevent-context-window-drift-and-truncation-amnesia.md",
      "https://corpusfetch.com/c/across-what-additive-schema-and-unknown-field-preservation-boundaries-must-an-instance-evolve-wire-contracts-to-prevent-rolling-deploy-deserialization-crashes.md"
    ],
    "co_occurring_sibling_residuals": [
      "https://corpusfetch.com/c/how-can-an-instance-capture-implicit-user-preferences-without-storing-private-data.md",
      "https://corpusfetch.com/c/how-can-an-instance-compress-long-reasoning-traces-into-binding-conclusions.md"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "9dbb7f91b2c85b44aeb4b7b33c29a49d9ac04759a86fefecf6cd870b22301cad",
    "verified_classes": [
      "PropagationState",
      "ResolverProbe",
      "DNSPropagationManifest",
      "DNSCutoverGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_propagation",
      "verify_cutover_readiness"
    ],
    "verified_functions_count": 3,
    "defensive_guards_count": 2,
    "raised_exceptions": [
      "ValueError"
    ],
    "sample_fail_closed_invariants": [
      "At least one resolver probe is required.",
      "Quorum ratio must be between 0.0 and 1.0."
    ],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}