{"abstract":"Nonroot spans export without required parent linkage.","category":"Observability","checks":8,"contract":"Export ended sampled spans that are not locally suppressed, have valid parent linkage when a parent is required, and carry the required service identity. Root spans need no parent.","contract_signature":"span","evaluation_group":"xt-trace-export","failed_approach":"The attempted repair substitutes bool(span['parent']). Fixture 1 still yields False instead of True.","family":"xt-trace-export-parent-linkage","id":"FA-10371","implementations":{"attempt":{"sha256":"9ece6d87cd9e47266e7c24519cb3e5966411a2bece7477a952532a121b0784a5","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(span):\n    return span['ended'] and span['sampled'] and not span['suppressed'] and bool(span['parent']) and bool(span['service'])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), True)\ncheck('fixture 2', solve({'ended': False, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 3', solve({'ended': True, 'sampled': False, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 4', solve({'ended': True, 'sampled': True, 'suppressed': True, 'root': True, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 5', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 6', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': 'p', 'service': 'api'}), True)\ncheck('fixture 7', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': ''}), False)\ncheck('fixture 8', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': '', 'service': 'api'}), 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":"271c3d3332901df8c11740f676011590654ec9a138e4e7c8fd415aab76100466","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(span):\n    return span['ended'] and span['sampled'] and not span['suppressed'] and True and bool(span['service'])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), True)\ncheck('fixture 2', solve({'ended': False, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 3', solve({'ended': True, 'sampled': False, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 4', solve({'ended': True, 'sampled': True, 'suppressed': True, 'root': True, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 5', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': None, 'service': 'api'}), False)\ncheck('fixture 6', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': 'p', 'service': 'api'}), True)\ncheck('fixture 7', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': ''}), False)\ncheck('fixture 8', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': '', 'service': 'api'}), 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-trace-export-parent-linkage","generated_at":"2026-09-29T14:38:38.469618+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"An offline model of trace export admission, suitable for testing build and release tooling without external services.","root_cause":"The implementation substitutes True for (span['root'] or span['parent'] is not None), so nonroot spans export without required parent linkage.","sha256":"bb3191b83a2121725271258188c07b9ab7af39bf4cd07c4db5c8553509eaf3c9","title":"Trace export admission: Nonroot spans export without required parent linkage · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.918,"exit_code":1,"observations":[{"actual":false,"check":"fixture 1","expected":true,"passed":false},{"actual":false,"check":"fixture 2","expected":false,"passed":true},{"actual":false,"check":"fixture 3","expected":false,"passed":true},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":false,"check":"fixture 5","expected":false,"passed":true},{"actual":true,"check":"fixture 6","expected":true,"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\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 7\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": false, \"expected\": true, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.69,"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":false,"passed":true},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":true,"check":"fixture 5","expected":false,"passed":false},{"actual":true,"check":"fixture 6","expected":true,"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\": false, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 7\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": true, \"expected\": true, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}