{"abstract":"Label insertion order fragments one series.","category":"Observability","checks":6,"contract":"A series identity includes metric name, sorted label key-value pairs excluding configured dropped keys, measurement unit, and instrument kind. Dropping values never drops other equal-valued labels.","evaluation_group":"xt-metric-series","failed_approach":"The attempted repair substitutes tuple(sorted(((k,v) for k,v in labels.items() if k not in dropped), reverse=True)). Fixture 1 still yields ('requests', (('z', '1'), ('a', '2')), 'count', 'counter') instead of ('requests', (('a', '2'), ('z', '1')), 'count', 'counter').","family":"xt-metric-series-label-canonicalization","id":"FA-10261","implementations":{"attempt":{"sha256":"6d17b18accbbae05a09a03e0900f523030914d60bb1e066ec381054c369d395b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(name, labels, dropped, unit, kind):\n    return (name, tuple(sorted(((k,v) for k,v in labels.items() if k not in dropped), reverse=True)), unit, kind)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve('requests', {'z': '1', 'a': '2'}, [], 'count', 'counter'), ('requests', (('a', '2'), ('z', '1')), 'count', 'counter'))\ncheck('fixture 2', solve('requests', {'a': '2', 'z': '1'}, [], 'count', 'counter'), ('requests', (('a', '2'), ('z', '1')), 'count', 'counter'))\ncheck('fixture 3', solve('requests', {'a': '2', 'z': '1'}, ['z'], 'count', 'counter'), ('requests', (('a', '2'),), 'count', 'counter'))\ncheck('fixture 4', solve('requests', {'a': 'same', 'b': 'same'}, ['a'], 'count', 'counter'), ('requests', (('b', 'same'),), 'count', 'counter'))\ncheck('fixture 5', solve('latency', {}, [], 'seconds', 'histogram'), ('latency', (), 'seconds', 'histogram'))\ncheck('fixture 6', solve('latency', {}, [], 'milliseconds', 'gauge'), ('latency', (), 'milliseconds', 'gauge'))\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":"9d29204c479d28917e6198cfb0ba922e8a8ee4ad649450bef80be631b86fa038","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(name, labels, dropped, unit, kind):\n    return (name, tuple((k,v) for k,v in labels.items() if k not in dropped), unit, kind)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve('requests', {'z': '1', 'a': '2'}, [], 'count', 'counter'), ('requests', (('a', '2'), ('z', '1')), 'count', 'counter'))\ncheck('fixture 2', solve('requests', {'a': '2', 'z': '1'}, [], 'count', 'counter'), ('requests', (('a', '2'), ('z', '1')), 'count', 'counter'))\ncheck('fixture 3', solve('requests', {'a': '2', 'z': '1'}, ['z'], 'count', 'counter'), ('requests', (('a', '2'),), 'count', 'counter'))\ncheck('fixture 4', solve('requests', {'a': 'same', 'b': 'same'}, ['a'], 'count', 'counter'), ('requests', (('b', 'same'),), 'count', 'counter'))\ncheck('fixture 5', solve('latency', {}, [], 'seconds', 'histogram'), ('latency', (), 'seconds', 'histogram'))\ncheck('fixture 6', solve('latency', {}, [], 'milliseconds', 'gauge'), ('latency', (), 'milliseconds', 'gauge'))\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":"9e2ad6d4ea502456262bee663f6abc3f165cc50c3dc77f1f1d028f1f461a694b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(name, labels, dropped, unit, kind):\n    return (name, tuple(sorted((k,v) for k,v in labels.items() if k not in dropped)), unit, kind)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve('requests', {'z': '1', 'a': '2'}, [], 'count', 'counter'), ('requests', (('a', '2'), ('z', '1')), 'count', 'counter'))\ncheck('fixture 2', solve('requests', {'a': '2', 'z': '1'}, [], 'count', 'counter'), ('requests', (('a', '2'), ('z', '1')), 'count', 'counter'))\ncheck('fixture 3', solve('requests', {'a': '2', 'z': '1'}, ['z'], 'count', 'counter'), ('requests', (('a', '2'),), 'count', 'counter'))\ncheck('fixture 4', solve('requests', {'a': 'same', 'b': 'same'}, ['a'], 'count', 'counter'), ('requests', (('b', 'same'),), 'count', 'counter'))\ncheck('fixture 5', solve('latency', {}, [], 'seconds', 'histogram'), ('latency', (), 'seconds', 'histogram'))\ncheck('fixture 6', solve('latency', {}, [], 'milliseconds', 'gauge'), ('latency', (), 'milliseconds', 'gauge'))\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-metric-series-label-canonicalization","generated_at":"2026-09-29T14:38:37.392361+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"An offline model of metric series identity, suitable for testing build and release tooling without external services.","repair":"Sort retained label pairs.","root_cause":"The implementation substitutes tuple((k,v) for k,v in labels.items() if k not in dropped) for tuple(sorted((k,v) for k,v in labels.items() if k not in dropped)), so label insertion order fragments one series.","sha256":"9b5c47c4a28dd23e8732c279ecceba5227b7aa33fda8bf9ebe5b7f13d5d9d9a8","title":"Metric series identity: Label insertion order fragments one series · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":41.719,"exit_code":1,"observations":[{"actual":["requests",[["z","1"],["a","2"]],"count","counter"],"check":"fixture 1","expected":["requests",[["a","2"],["z","1"]],"count","counter"],"passed":false},{"actual":["requests",[["z","1"],["a","2"]],"count","counter"],"check":"fixture 2","expected":["requests",[["a","2"],["z","1"]],"count","counter"],"passed":false},{"actual":["requests",[["a","2"]],"count","counter"],"check":"fixture 3","expected":["requests",[["a","2"]],"count","counter"],"passed":true},{"actual":["requests",[["b","same"]],"count","counter"],"check":"fixture 4","expected":["requests",[["b","same"]],"count","counter"],"passed":true},{"actual":["latency",[],"seconds","histogram"],"check":"fixture 5","expected":["latency",[],"seconds","histogram"],"passed":true},{"actual":["latency",[],"milliseconds","gauge"],"check":"fixture 6","expected":["latency",[],"milliseconds","gauge"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [\"requests\", [[\"z\", \"1\"], [\"a\", \"2\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [\"requests\", [[\"z\", \"1\"], [\"a\", \"2\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [\"requests\", [[\"a\", \"2\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"requests\", [[\"b\", \"same\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"b\", \"same\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": [\"latency\", [], \"seconds\", \"histogram\"], \"expected\": [\"latency\", [], \"seconds\", \"histogram\"], \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": [\"latency\", [], \"milliseconds\", \"gauge\"], \"expected\": [\"latency\", [], \"milliseconds\", \"gauge\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.106,"exit_code":1,"observations":[{"actual":["requests",[["z","1"],["a","2"]],"count","counter"],"check":"fixture 1","expected":["requests",[["a","2"],["z","1"]],"count","counter"],"passed":false},{"actual":["requests",[["a","2"],["z","1"]],"count","counter"],"check":"fixture 2","expected":["requests",[["a","2"],["z","1"]],"count","counter"],"passed":true},{"actual":["requests",[["a","2"]],"count","counter"],"check":"fixture 3","expected":["requests",[["a","2"]],"count","counter"],"passed":true},{"actual":["requests",[["b","same"]],"count","counter"],"check":"fixture 4","expected":["requests",[["b","same"]],"count","counter"],"passed":true},{"actual":["latency",[],"seconds","histogram"],"check":"fixture 5","expected":["latency",[],"seconds","histogram"],"passed":true},{"actual":["latency",[],"milliseconds","gauge"],"check":"fixture 6","expected":["latency",[],"milliseconds","gauge"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [\"requests\", [[\"z\", \"1\"], [\"a\", \"2\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [\"requests\", [[\"a\", \"2\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"requests\", [[\"b\", \"same\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"b\", \"same\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": [\"latency\", [], \"seconds\", \"histogram\"], \"expected\": [\"latency\", [], \"seconds\", \"histogram\"], \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": [\"latency\", [], \"milliseconds\", \"gauge\"], \"expected\": [\"latency\", [], \"milliseconds\", \"gauge\"], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.527,"exit_code":0,"observations":[{"actual":["requests",[["a","2"],["z","1"]],"count","counter"],"check":"fixture 1","expected":["requests",[["a","2"],["z","1"]],"count","counter"],"passed":true},{"actual":["requests",[["a","2"],["z","1"]],"count","counter"],"check":"fixture 2","expected":["requests",[["a","2"],["z","1"]],"count","counter"],"passed":true},{"actual":["requests",[["a","2"]],"count","counter"],"check":"fixture 3","expected":["requests",[["a","2"]],"count","counter"],"passed":true},{"actual":["requests",[["b","same"]],"count","counter"],"check":"fixture 4","expected":["requests",[["b","same"]],"count","counter"],"passed":true},{"actual":["latency",[],"seconds","histogram"],"check":"fixture 5","expected":["latency",[],"seconds","histogram"],"passed":true},{"actual":["latency",[],"milliseconds","gauge"],"check":"fixture 6","expected":["latency",[],"milliseconds","gauge"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"], [\"z\", \"1\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [\"requests\", [[\"a\", \"2\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"a\", \"2\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"requests\", [[\"b\", \"same\"]], \"count\", \"counter\"], \"expected\": [\"requests\", [[\"b\", \"same\"]], \"count\", \"counter\"], \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": [\"latency\", [], \"seconds\", \"histogram\"], \"expected\": [\"latency\", [], \"seconds\", \"histogram\"], \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": [\"latency\", [], \"milliseconds\", \"gauge\"], \"expected\": [\"latency\", [], \"milliseconds\", \"gauge\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}