feat(evaluator): prefer OTLP over ATIF when reading agent traces - #1717
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. 📝 WalkthroughWalkthroughThe SDK adds shared OTLP trace parsing, format-aware evidence handles, and automatic Harbor trace selection. Evaluation consumers now select ATIF or OTLP explicitly, with defined fallback and error behavior. ChangesTrace evidence handling
Sequence Diagram(s)sequenceDiagram
participant HarborAgentTaskRunner
participant _trial_from_harbor_result
participant CandidateEvidence
participant final_output_text
HarborAgentTaskRunner->>_trial_from_harbor_result: adapt Harbor job result
_trial_from_harbor_result->>CandidateEvidence: register ATIF and OTLP descriptors
CandidateEvidence-->>_trial_from_harbor_result: select OTLP or ATIF standard trace
_trial_from_harbor_result->>final_output_text: extract OTLP final output
final_output_text-->>_trial_from_harbor_result: return output or no answer
_trial_from_harbor_result-->>HarborAgentTaskRunner: return adapted trial
Merge Risk: ⚪ Minimal · up to The trace-format changes have no identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 33.05% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 118 functions across 10 files. (5 skipped: 5 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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In `@packages/nemo_evaluator_sdk/src/nemo_evaluator_sdk/values/otlp.py`:
- Around line 130-135: Update export_request_from_resource_spans and its
_base64_ids/_any_value_strings helpers to normalize RecursionError from deepcopy
or nested value traversal into ValueError, and replace recursive
arrayValue/kvlistValue traversal with an explicit stack. Preserve successful
decoding of deeply nested valid payloads and add regression coverage for those
cases.
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Posting the five verified findings from the requested evaluator trace-format review.
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ATIF's turn-based shape cannot represent span timing, concurrency, or per-call detail, so OTLP becomes the trace the evaluator reads first. `CandidateEvidence.trace()` gains a keyword-only `format` selector with overloads, so a metric asks for the view its question needs and gets a narrowed handle. Harbor registers both encodings under `trace:atif` and `trace:otlp`, making the format decide which view is primary rather than which is reachable. The handle cache moves off `name` onto the resolved descriptor key: keyed on `name` alone, asking for OTLP after ATIF returned the cached ATIF handle, so the static type and the runtime object disagreed and failed far from the cause. The `trace_format` runner config is deleted rather than deprecated. The primary trace is now OTLP when the agent emits one and ATIF otherwise, which removes the failure mode the setting created: a configured format that matched no artifact left the trial with no trace at all. `output_text` follows the same preference, falling back to ATIF. Without that, preferring OTLP would null it for agents emitting both, and it feeds the content metrics, where a missing candidate raises rather than scores. OTLP/JSON encodes trace and span ids as hex, departing from the protobuf JSON mapping `ParseDict` implements, which reads them as base64. Left alone a 16-character span id decodes to twelve unrelated bytes, so ids stop matching what the producer recorded. Nothing here reads an id yet, but the decoder is wrong for anything that does. Scope is the evaluator only. The Experimentalist has its own Harbor adapter and never passed `trace_format` to the SDK runner, so its config is untouched. Adding `opentelemetry-proto` to the SDK also regenerates three bundled dependency manifests (`make vendor`) and relocks. The relock carries 371 platform wheel URLs for already-pinned versions — drift that stayed invisible because the uv-lock hook only runs when a pyproject changes. No package version or resolution changed. Signed-off-by: Sandy Chapman <schapman@nvidia.com>
Each finding was reproduced against the code before anything changed. Reading a trace no longer lets a producer's nesting depth become this process's recursion limit: `_any_value_strings` walks an explicit stack, and `export_request_from_resource_spans` normalizes the `RecursionError` that `deepcopy` can still raise into the `ValueError` its callers guard on. Only AGENT, CHAIN and LLM spans can supply the final answer. A tool result and a judge's score are recorded under the same `output.value` key an answer uses, so an include list keeps one from being scored as the model's own; an unrecognized or absent kind is ineligible rather than admitted. A `gen_ai.output.messages` payload carrying no assistant text now yields nothing instead of its raw JSON, so the ATIF answer still stands rather than the trial being scored against serialized telemetry. Both the primary trace and the answer now follow from one read of the OTLP file. Discovery names it from its artifact path, which proves nothing about whether it parses, so a malformed file was becoming the trial's trace and handing every default consumer an unreadable handle. `SkillUsedMetric` resolves and reads each view in turn for the same reason, OTLP first, so a file that will not parse falls through instead of answering for the trial. In the docs, the `format=` snippet is wrapped in a function so it type checks — which also makes the check prove the narrowing it describes — and the component-scoring metric asks for `format="atif"` directly, scoring a trial that recorded no ATIF view as 0.0 rather than raising. Signed-off-by: Sandy Chapman <schapman@nvidia.com>
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Summary
ATIF's turn-based shape cannot represent span timing, concurrency, or per-call detail, so the evaluator now reads OTLP first. A metric can ask for the trace view its question needs (
evidence.trace(format="otlp")) and get a narrowed handle back; a Harbor trial that emits both encodings exposes both. Thetrace_formatrunner config is deleted — the primary trace is OTLP when the agent emits one and ATIF otherwise.Before: one config-selected trace view, and a configured format that matched no artifact left the trial with no trace at all. After: both views are always reachable, and the choice of primary is a property of what the trial contains.
Publishing OTLP to Intake is deliberately not in this PR — see below.
Related Issue
Part of AALGO-569 (Linear). Not a GitHub issue, so no
Fixeskeyword.Changes
CandidateEvidence.trace()takes a keyword-onlyformatwith@overloaddeclarations, soformat="atif"narrows toATIFTraceHandleandformat="otlp"toOTLPTraceHandle.trace()with noformatis unchanged and returns the union, so no existing caller needed a port.name. Keyed onnamealone, asking for OTLP after ATIF returned the cached ATIF handle — the static type promisedOTLPTraceHandleand the runtime raisedAttributeErrorfar from the cause.descriptor.format, never on its key suffix, so a mis-filed descriptor cannot falsify the caller's narrowed return type.trace:atifandtrace:otlpalongside the standardtracekey.trace_formatdeleted end-to-end (3harbor_runtimesignatures,_validate_trace_format, 2harbor_trial_adaptersignatures, and therunner_info()key), along with the "configured format matched no trace artifact" warning branch and its tests.output_textnow comes from the OTLP trace, falling back to ATIF. Root span preferred, else the latest-ending span carrying an output attribute.values/otlp.py— OTLP/JSON decoding moved out ofOTLPTraceHandle, plus protobuf parsing viaopentelemetry-protoand final-answer extraction.SkillUsedMetricresolves ATIF first, falling back to OTLP, so its answer is independent of which encoding a runner made primary while still working for agents that emit only spans.make vendor). Thenemo-evaluator-sdkextra is mirrored intopackages/nemo_platform,packages/nemo_platform_plugin, andsdk/python/nemo-platform, so adding a dependency to the SDK leaves all three stale. Second commit; no hand edits.atif_steps_from_trialreads the ATIF view by name rather than the primary trace, keeping absent distinct from unreadable.Design notes
The output-attribute key list is deliberately narrower than Intake's. Intake's
OTLP_OUTPUT_PAYLOAD_ATTRIBUTE_KEYSanswers "what payload did this span emit" for storage and admitsgen_ai.tool.call.result/tool_response. A tool result is not the agent's answer, andoutput_textis compared against a reference byexact_match/bleu/rouge, so admitting one would score a tool's output as the model's. Duplicated rather than imported because the SDK ships independently of the services.Text search reads decoded JSON, not the parsed protobuf.
ParseDictis strict, so one span with a malformed unrelated field would fail the whole batch and hide every other span's attributes — a false negative inSkillUsedMetric, which corrupts a skill A/B result.Scope is the evaluator only. The Experimentalist has its own complete Harbor adapter and never passed
trace_formatto the SDK runner, so its config field is untouched. Verified: its suite passes unmodified against this change.Deliberately left out: publishing OTLP to Intake. That changes how spans are identified in a
ReplacingMergeTreekeyed on(workspace, session_id, start_time, id), where a wrong session id republishes as duplicates instead of replacing — a different risk class that deserves isolated review and a live round-trip test. It follows as a stacked PR.Type of Change
Quality Gates
docs/evaluator/agent-eval/writing-metrics.mdxgained an "Asking for one trace format" section; its handle table and the description of whattrace()returns were corrected.Verification
Signed-off-by:traileruv run pre-commit run -apasses, or any blocked checks are identified belowTargeted validation:
pytest packages/nemo_evaluator_sdk/tests plugins/nemo-evaluator/testspytest plugins/nemo-experimentalist/testspytest plugins/nemo-eval-author/tests plugins/nemo-optimization/teststools/lint/lint-python-types.sh(CI's type gate)uv run ruff check packages pluginsuv run ruff format --check packages pluginsdocs/fernvalidate-mdxpre-commit run -a— two hooks did not pass, neither caused by this changety— 9 diagnostics, all pre-existing. Six are intest_harbor_runtime.py:2159-2188, below this PR's last hunk at+2189; three areunused-ignore-commentwarnings on# ty: ignore[unresolved-import]directives atharbor_runtime.py:806-808, which no hunk touches. All are verbatim onmain. The local hook runs barety check, while CI'stools/lint/lint-python-types.shpasses--ignore unresolved-attribute --ignore unused-ignore-comment, which is why the CI gate is green and the local hook is not.uv-lock— environment, and the artifact is verified correct. The hook requires uv 0.9.14; this shell has 0.9.30. I re-ranuv lockunder the repo's pinned toolchain (flox activate --dir tools/python, uv 0.9.14) and the result is byte-identical to the committeduv.lock, so the lock is right even though the hook could not confirm it here.Every other hook passed, including copyright headers, config-reference docs, helm-docs, uv-lock drift, and the plugin/
nmp-commonboundary check.Summary by CodeRabbit
New Features
Improvements
Documentation