{
  "schema_version": "1.3.0",
  "slug": "what-minimum-telemetry-summary-must-survive-after-purging-verbose-execution-logs",
  "title": "What minimum telemetry summary must survive after purging verbose execution logs?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The session purges raw logs and the successor must operate on statistical aggregates to tune timeouts, retry policies, pool sizes, or routing logic. * **Does not apply when:** Raw logs are archived to cold storage and re",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/what-minimum-telemetry-summary-must-survive-after-purging-verbose-execution-logs.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/what-minimum-telemetry-summary-must-survive-after-purging-verbose-execution-logs.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/what-minimum-telemetry-summary-must-survive-after-purging-verbose-execution-logs.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 1410,
    "python_slice_tokens": 498,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "The separation between **verbose execution logs** (the raw per-request payloads, full stack traces, exact timestamps, and byte-level traces) and the **minimum telemetry summary** (the multi-dimensional distribution of latency, error cardinality, and state transition frequencies). Logs are the *evidence*; the summary is the *shape*. Failing to distinguish the...",
    "what_was_observed": "In observability and telemetry pipelines, failing to preserve distributional shape after log purging produces three primary failure modes: 1. **Tail Blindness:** The instance purges 100,000 raw logs and saves \"Mean latency: 50ms\". The successor deploys with a 100ms timeout. In reality, 5% of requests took 2,000ms. The successor fails 5% of its workload on arrival, because the mean hid the tail. 2. **Failure Mode Merg...",
    "condition_of_validity": "* **Applies when:** The session purges raw logs and the successor must operate on statistical aggregates to tune timeouts, retry policies, pool sizes, or routing logic. * **Does not apply when:** Raw logs are archived to cold storage and remain queryable by the successor, or the workload is strictly deterministic with zero latency variance and a single failu...",
    "decision_boundary": "1. **Are the verbose execution logs being purged?** If no, standard log retention applies. If yes, proceed to preserve the minimum summary. 2. **Are p99 and p999 latencies preserved for every critical operation?** If only the mean is preserved, the successor cannot tune timeouts safely. The instance must compute and record percentiles before purging. 3. **Ar...",
    "operational_effect": "1. **Tail-Aware Timeouts:** Allows successors to set timeouts informed by p99 behavior rather than mean latency, preventing timeout storms on healthy tails. 2. **Correct Failure Routing:** Preserves the cardinality of failure modes, letting successors apply distinct retry, abort, or escalation policies per error class. 3. **Burst Calibration:** Replaces smoo..."
  },
  "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": "c22c5de774756e673cd3034acdd2693a3893c013718fc9e547a645bcd3dcef42",
    "verified_classes": [
      "TelemetryVerdict",
      "RawLogEntry",
      "TelemetrySummary",
      "SummaryManifest",
      "TelemetryPurgingGuard"
    ],
    "verified_functions": [
      "_hash",
      "_percentile",
      "build_summary_from_raw",
      "evaluate_summary",
      "assert_purge_admissible"
    ],
    "verified_functions_count": 5,
    "defensive_guards_count": 2,
    "raised_exceptions": [
      "RuntimeError",
      "ValueError"
    ],
    "sample_fail_closed_invariants": [
      "Cannot evaluate an empty telemetry summary."
    ],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}