fix(benchmark): report expected cancellation runs

[afourniernv]

What

Preserve expected all-timeout results from the client-cancellation benchmark so the existing report and error-rate gate can run.

When AIPerf 0.11.0 omits its summary, the benchmark now rebuilds the three required summary metrics from its per-request JSONL records. Other scenarios and successful AIPerf runs keep their existing path.

Why

AIPerf exits 1 before writing profile_export_aiperf.json when every request times out. That is expected for client-cancellation, which permits an 80%-100% error rate, but the wrapper currently aborts before writing the combined Markdown, JSON, and CSV reports.

SWITCH-1519

Notes for reviewers

Recovery is opt-in for client-cancellation and requires AIPerf's exact all-failed message, the expected record count, and only TimeoutError records. Malformed output, transport failures, count mismatches, other exit codes, and other scenarios still fail normally.

The change is limited to the benchmark scripts. It adds no Rust, PyO3, package, configuration, or published API surface. The log and JSONL files are read line by line rather than collected in memory.

Validation:

• uv run ruff check .
• uv run mypy scripts/aiperf_runner.py scripts/benchmark_routing_algorithms.py
• uv run pytest tests/test_aiperf_runner.py tests/test_routing_performance_report.py -q -o addopts= - 12 passed
• git diff --check
• Exact 20-request reproduction from SWITCH-1519 against the shipped synthetic backend: all three reports were written and the 100% error rate passed the configured 80%-100% gate
• Live negative control against an unused port: ClientConnectorError remained fatal and no summary was synthesized
• Live successful classifier-mix control: the normal AIPerf export and report path remained unchanged

Summary by CodeRabbit

• Bug Fixes

  • Client-cancellation benchmark results now capture expected request timeouts when all requests time out, instead of failing to produce an export. Unrelated failures continue to be reported as errors.

• Tests

  • Added coverage for timeout recovery and for failures that should still be reported as errors.

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📒 Files selected for processing (3)

• scripts/aiperf_runner.py
• tests/test_aiperf_runner.py
• tests/test_routing_performance_report.py

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Walkthrough

Changes

The profiling runner can recover qualifying status-1 failures by writing a synthetic export with zero successful requests and throughput. The routing benchmark supplies an expected timeout count only for client-cancellation. Tests cover recovery conditions and other status-1 failures.

Timeout Recovery

Layer / File(s)	Summary
Synthetic timeout export recovery scripts/aiperf_runner.py	run_profile accepts an optional expected timeout count. For status-1 failures, it writes a synthetic export only when the log contains the all-failed message and the profile has the expected number of TimeoutError records.
Client-cancellation expectation wiring scripts/benchmark_routing_algorithms.py	run_aiperf passes config.request_count as the expected timeout count only for client-cancellation.
Recovery and routing test coverage tests/test_aiperf_runner.py, tests/test_routing_performance_report.py	Tests cover matching timeout records, connector errors, worker crashes, and a test double that accepts additional keyword arguments.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Merge Risk: ⚪ Minimal · up to a10fa

Expected all-timeout runs can produce the configured reports and pass the cancellation error-rate gate. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the benchmark fix and the reporting of expected cancellation runs, which matches the main change.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

---

_{A rabbit checks the timeout count,
Then watches zero successes mount.
The log and records match just right,
A synthetic export comes to light.
The hare bounds off through fields of green.}

_{Comment @coderabbitai help to get the list of available commands.}

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Actionable comments posted: 1

---

• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@tests/test_aiperf_runner.py`:
- Around line 120-122: Add the requested type annotations to
test_run_profile_recovers_only_expected_timeouts parameters: use Path for
tmp_path, str for error_type and log_message, list[str] for cause_chain, and
bool for recovers; also annotate the related _command callback parameter as
Sequence[str], reusing the appropriate existing imports.

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📥 Commits

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📒 Files selected for processing (4)

• scripts/aiperf_runner.py
• scripts/benchmark_routing_algorithms.py
• tests/test_aiperf_runner.py
• tests/test_routing_performance_report.py

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