FA-10356 / Observability / Open access

Trace export admission: Unfinished spans enter completed-span exports · case 01

Unfinished spans enter completed-span exports.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation substitutes True for span['ended'], so unfinished spans enter completed-span exports.

VERIFIED REPAIR

Export only completed spans.

Unsuccessful approach: The attempted repair substitutes not span['ended']. Fixture 1 still yields False instead of True.

Case 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.

Why this case matters

An offline model of trace export admission, suitable for testing build and release tooling without external services.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(span):
    return True and span['sampled'] and not span['suppressed'] and (span['root'] or span['parent'] is not None) and bool(span['service'])
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), True)
check('fixture 2', solve({'ended': False, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 3', solve({'ended': True, 'sampled': False, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 4', solve({'ended': True, 'sampled': True, 'suppressed': True, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 5', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': None, 'service': 'api'}), False)
check('fixture 6', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': 'p', 'service': 'api'}), True)
check('fixture 7', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': ''}), False)
check('fixture 8', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': '', 'service': 'api'}), True)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
fixture 1	`True`	`True`	Passed
fixture 2	`True`	`False`	Failed
fixture 3	`False`	`False`	Passed
fixture 4	`False`	`False`	Passed
fixture 5	`False`	`False`	Passed
fixture 6	`True`	`True`	Passed
fixture 7	`False`	`False`	Passed
fixture 8	`True`	`True`	Passed

SHA-256 / dd50f8a0bac0c738259411a99603cde7eca5e016e05857c0911356f4a42eb9c3

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(span):
    return not span['ended'] and span['sampled'] and not span['suppressed'] and (span['root'] or span['parent'] is not None) and bool(span['service'])
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), True)
check('fixture 2', solve({'ended': False, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 3', solve({'ended': True, 'sampled': False, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 4', solve({'ended': True, 'sampled': True, 'suppressed': True, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 5', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': None, 'service': 'api'}), False)
check('fixture 6', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': 'p', 'service': 'api'}), True)
check('fixture 7', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': ''}), False)
check('fixture 8', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': '', 'service': 'api'}), True)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
fixture 1	`False`	`True`	Failed
fixture 2	`True`	`False`	Failed
fixture 3	`False`	`False`	Passed
fixture 4	`False`	`False`	Passed
fixture 5	`False`	`False`	Passed
fixture 6	`False`	`True`	Failed
fixture 7	`False`	`False`	Passed
fixture 8	`False`	`True`	Failed

SHA-256 / 659bddd07ad210d943e59fe6f5b5f5d4ad9b53710b166af5907387b049e6233d

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(span):
    return span['ended'] and span['sampled'] and not span['suppressed'] and (span['root'] or span['parent'] is not None) and bool(span['service'])
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), True)
check('fixture 2', solve({'ended': False, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 3', solve({'ended': True, 'sampled': False, 'suppressed': False, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 4', solve({'ended': True, 'sampled': True, 'suppressed': True, 'root': True, 'parent': None, 'service': 'api'}), False)
check('fixture 5', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': None, 'service': 'api'}), False)
check('fixture 6', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': 'p', 'service': 'api'}), True)
check('fixture 7', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': True, 'parent': None, 'service': ''}), False)
check('fixture 8', solve({'ended': True, 'sampled': True, 'suppressed': False, 'root': False, 'parent': '', 'service': 'api'}), True)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
fixture 1	`True`	`True`	Passed
fixture 2	`False`	`False`	Passed
fixture 3	`False`	`False`	Passed
fixture 4	`False`	`False`	Passed
fixture 5	`False`	`False`	Passed
fixture 6	`True`	`True`	Passed
fixture 7	`False`	`False`	Passed
fixture 8	`True`	`True`	Passed

SHA-256 / c9b027824267f8e56176f86b625af6a6ba5bc7c45d30748372cfa35d2c70e306

Verification & scope

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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:38:38.253753+00:00.

Case digest / 8e1c6b7339e3bc0c8345ab043b369eab78cd2c585a640914f79186b1b152ae0e