{"abstract":"Logs exactly at threshold disappear.","category":"Observability","checks":8,"contract":"Emit a log only when severity reaches the threshold, logger is enabled, sampling selected it, it is not suppressed, and all required fields exist. False-valued fields count as present.","evaluation_group":"xt-log-policy","failed_approach":"The attempted repair substitutes event['level'] == threshold. Fixture 3 still yields False instead of True.","family":"xt-log-policy-severity-threshold","id":"FA-10281","implementations":{"attempt":{"sha256":"baf06cbee527096c9f52ddeb81330d3fcb4c792680aad99b3fc60881c71a3173","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(event, threshold, enabled, sampled, suppressed, required):\n    return event['level'] == threshold and enabled and sampled and not suppressed and set(required) <= set(event)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'level': 2, 'message': 'x'}, 2, True, True, False, ['message']), True)\ncheck('fixture 2', solve({'level': 1, 'message': 'x'}, 2, True, True, False, ['message']), False)\ncheck('fixture 3', solve({'level': 3, 'message': 'x'}, 2, True, True, False, ['message']), True)\ncheck('fixture 4', solve({'level': 2, 'message': 'x'}, 2, False, True, False, ['message']), False)\ncheck('fixture 5', solve({'level': 2, 'message': 'x'}, 2, True, False, False, ['message']), False)\ncheck('fixture 6', solve({'level': 2, 'message': 'x'}, 2, True, True, True, ['message']), False)\ncheck('fixture 7', solve({'level': 2}, 2, True, True, False, ['message']), False)\ncheck('fixture 8', solve({'level': 2, 'message': False}, 2, True, True, False, ['message']), True)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"e8510d15b07f32e8ae1936a7e0cc0393eed5fe80a80b58e8793941c6a5078cef","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(event, threshold, enabled, sampled, suppressed, required):\n    return event['level'] > threshold and enabled and sampled and not suppressed and set(required) <= set(event)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'level': 2, 'message': 'x'}, 2, True, True, False, ['message']), True)\ncheck('fixture 2', solve({'level': 1, 'message': 'x'}, 2, True, True, False, ['message']), False)\ncheck('fixture 3', solve({'level': 3, 'message': 'x'}, 2, True, True, False, ['message']), True)\ncheck('fixture 4', solve({'level': 2, 'message': 'x'}, 2, False, True, False, ['message']), False)\ncheck('fixture 5', solve({'level': 2, 'message': 'x'}, 2, True, False, False, ['message']), False)\ncheck('fixture 6', solve({'level': 2, 'message': 'x'}, 2, True, True, True, ['message']), False)\ncheck('fixture 7', solve({'level': 2}, 2, True, True, False, ['message']), False)\ncheck('fixture 8', solve({'level': 2, 'message': False}, 2, True, True, False, ['message']), True)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"f4bbb946152e17c26a856a860be6e984a70a96eaa3cc9b26f45ef7745c0f0652","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(event, threshold, enabled, sampled, suppressed, required):\n    return event['level'] >= threshold and enabled and sampled and not suppressed and set(required) <= set(event)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'level': 2, 'message': 'x'}, 2, True, True, False, ['message']), True)\ncheck('fixture 2', solve({'level': 1, 'message': 'x'}, 2, True, True, False, ['message']), False)\ncheck('fixture 3', solve({'level': 3, 'message': 'x'}, 2, True, True, False, ['message']), True)\ncheck('fixture 4', solve({'level': 2, 'message': 'x'}, 2, False, True, False, ['message']), False)\ncheck('fixture 5', solve({'level': 2, 'message': 'x'}, 2, True, False, False, ['message']), False)\ncheck('fixture 6', solve({'level': 2, 'message': 'x'}, 2, True, True, True, ['message']), False)\ncheck('fixture 7', solve({'level': 2}, 2, True, True, False, ['message']), False)\ncheck('fixture 8', solve({'level': 2, 'message': False}, 2, True, True, False, ['message']), True)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xt-log-policy-severity-threshold","generated_at":"2026-09-29T14:38:37.492208+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"An offline model of structured log emission policy, suitable for testing build and release tooling without external services.","repair":"Use an inclusive minimum severity.","root_cause":"The implementation substitutes event['level'] > threshold for event['level'] >= threshold, so logs exactly at threshold disappear.","sha256":"09013b4bb288cfd5cb4e7cfc58977296656f0f0e3232fde9cec78995ba490502","title":"Structured log emission policy: Logs exactly at threshold disappear · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":41.877,"exit_code":1,"observations":[{"actual":true,"check":"fixture 1","expected":true,"passed":true},{"actual":false,"check":"fixture 2","expected":false,"passed":true},{"actual":false,"check":"fixture 3","expected":true,"passed":false},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":false,"check":"fixture 5","expected":false,"passed":true},{"actual":false,"check":"fixture 6","expected":false,"passed":true},{"actual":false,"check":"fixture 7","expected":false,"passed":true},{"actual":true,"check":"fixture 8","expected":true,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 7\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": true, \"expected\": true, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.808,"exit_code":1,"observations":[{"actual":false,"check":"fixture 1","expected":true,"passed":false},{"actual":false,"check":"fixture 2","expected":false,"passed":true},{"actual":true,"check":"fixture 3","expected":true,"passed":true},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":false,"check":"fixture 5","expected":false,"passed":true},{"actual":false,"check":"fixture 6","expected":false,"passed":true},{"actual":false,"check":"fixture 7","expected":false,"passed":true},{"actual":false,"check":"fixture 8","expected":true,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 7\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": false, \"expected\": true, \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":42.668,"exit_code":0,"observations":[{"actual":true,"check":"fixture 1","expected":true,"passed":true},{"actual":false,"check":"fixture 2","expected":false,"passed":true},{"actual":true,"check":"fixture 3","expected":true,"passed":true},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":false,"check":"fixture 5","expected":false,"passed":true},{"actual":false,"check":"fixture 6","expected":false,"passed":true},{"actual":false,"check":"fixture 7","expected":false,"passed":true},{"actual":true,"check":"fixture 8","expected":true,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 7\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": true, \"expected\": true, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}