{"abstract":"Unfinished spans enter completed-span exports.","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.","evaluation_group":"xt-trace-export","failed_approach":"The attempted repair substitutes not span['ended']. Fixture 1 still yields False instead of True.","family":"xt-trace-export-unfinished-span","id":"FA-10356","implementations":{"attempt":{"sha256":"659bddd07ad210d943e59fe6f5b5f5d4ad9b53710b166af5907387b049e6233d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(span):\n    return not span['ended'] and span['sampled'] and not span['suppressed'] and (span['root'] or span['parent'] is not None) 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":"dd50f8a0bac0c738259411a99603cde7eca5e016e05857c0911356f4a42eb9c3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(span):\n    return True and span['sampled'] and not span['suppressed'] and (span['root'] or span['parent'] is not None) 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"},"fixed":{"sha256":"c9b027824267f8e56176f86b625af6a6ba5bc7c45d30748372cfa35d2c70e306","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 (span['root'] or span['parent'] is not None) 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-unfinished-span","generated_at":"2026-09-29T14:38:38.253753+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.","repair":"Export only completed spans.","root_cause":"The implementation substitutes True for span['ended'], so unfinished spans enter completed-span exports.","sha256":"8e1c6b7339e3bc0c8345ab043b369eab78cd2c585a640914f79186b1b152ae0e","title":"Trace export admission: Unfinished spans enter completed-span exports · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.744,"exit_code":1,"observations":[{"actual":false,"check":"fixture 1","expected":true,"passed":false},{"actual":true,"check":"fixture 2","expected":false,"passed":false},{"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":false,"check":"fixture 6","expected":true,"passed":false},{"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\": true, \"expected\": false, \"passed\": false}, {\"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\": false, \"expected\": true, \"passed\": false}, {\"check\": \"fixture 7\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": false, \"expected\": true, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.414,"exit_code":1,"observations":[{"actual":true,"check":"fixture 1","expected":true,"passed":true},{"actual":true,"check":"fixture 2","expected":false,"passed":false},{"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":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\": true, \"expected\": false, \"passed\": false}, {\"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\": true, \"expected\": true, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":45.102,"exit_code":0,"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":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":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\": 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\": true, \"expected\": true, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}