feat(observability): derive OTLP IDs from Relay UUIDs

[willkill07]

Overview

• Derive OpenTelemetry and OpenInference trace and span identifiers from Relay event UUIDs.

• I confirm this contribution is my own work, or I have the right to submit it under this project's license.

• I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

• Map the full root Relay UUID to the OTLP trace ID and the lower 64 bits of each Relay UUID to its OTLP span ID.
• Apply the mapping to lifecycle spans and all generated orphan or tool-projected mark spans.
• Cover root, child, orphan, and zero-byte conversion behavior for both exporters.

Where should the reviewer start?

Review crates/core/src/observability/mod.rs for the shared conversions, then the OTel and OpenInference event processors and their deterministic mapping tests.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Closes RELAY-491

Summary by CodeRabbit

• Enhancements

  • OpenTelemetry and OpenInference tracing now deterministically derive trace/span identifiers from Relay event UUIDs, producing consistent IDs across agent, model/tool-projection, and orphan checkpoint spans (including scenarios without parent linkage).

• Tests

  • Updated observability unit tests to use fixed Relay UUIDs and validate byte-level trace/span derivation and expected span linkage.
  • Adjusted exporter parity test expectations to ensure OTEL and OpenInference session traces correlate with matching trace IDs.

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**/*.rs

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

**/*.rs: Any Rust change must run just test-rust
Any Rust change must run cargo fmt --all
Any Rust change must run cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all for all FFI work since it is Rust work
Run just test-rust to validate FFI changes
Run cargo clippy --workspace --all-targets -- -D warnings to enforce strict linting on FFI work

When Rust files changed as part of Go work, also run cargo fmt --all, just test-rust, and cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all when Rust files are changed as part of Node work
Run cargo clippy --workspace --all-targets -- -D warnings when Rust files are changed as part of Node work
Run just test-rust when Rust files are changed as part of Node work

When changing the core Rust runtime or Rust-facing API surface, format Rust code with cargo fmt (rustfmt defaults), keep cargo clippy -- -D warnings clean, and satisfy cargo deny check per deny.toml.

**/*.rs: If any Rust code changed, always run just test-rust.
If any Rust code changed, also run cargo fmt --all.
If any Rust code changed, also run cargo clippy --workspace --all-targets -- -D warnings.
For Rust changes headed for review, run cargo fmt --all and cargo clippy --workspace --all-targets -- -D warnings even if relying on pre-commit.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

{crates/core,crates/adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

Changes to crates/core or crates/adaptive must run the full language matrix

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

crates/core/**/*.rs

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If the change touched crates/core or shared runtime semantics, also use validate-change for broader validation

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

**/*.{rs,py}

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Follow binding naming conventions in Rust and Python: use snake_case.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

**/*.{rs,py,js,mjs,cjs,ts,tsx}

📄 CodeRabbit inference engine (AGENTS.md)

**/*.{rs,py,js,mjs,cjs,ts,tsx}: Use Json = serde_json::Value in Rust-facing runtime APIs where the existing code expects JSON payloads.
Use Result<T> with FlowError in core runtime paths, and keep errors explicit and binding-appropriate at the wrapper layer.
Keep async behavior on the existing tokio-based model; bindings should preserve callback and future lifetimes rather than blocking or hiding async work unexpectedly.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

**/*.{rs,py,go,js,ts,c,h}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Use language-appropriate naming conventions: Rust snake_case, C FFI exports prefixed nemo_relay_, Go PascalCase, Node.js camelCase, and Python snake_case.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

**/*.{rs,go,js,ts}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Add the SPDX license header to all Rust, Go, JavaScript, and TypeScript source files using the corresponding // comment form.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

**/*: Format changed files with the language-native formatter before the final lint/test pass.
If dynamic plugin behavior changed, use maintain-dynamic-plugins and include the native SDK, worker protocol, Python SDK, docs, packaging, and Codecov surfaces in the validation plan.
If code changes alter APIs, bindings, commands, paths, packaging behavior, observability/adaptive semantics, or documented best practices, update any dependent maintainer or consumer skills in the same branch.
During iteration, prefer uv run pre-commit run --files <changed files...>.
Before review or handoff, run uv run pre-commit run --all-files.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

crates/{core,adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If crates/core or crates/adaptive changed, run the full validation matrix across Rust, Python, Go, and Node.js.

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• crates/core/tests/unit/observability/exporter_parity_tests.rs

**/*.{rs,py,go,js,ts}

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If a language surface changed, always run that language's test target even when Rust core did not change.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

crates/{core,adaptive}/**/*.rs

⚙️ CodeRabbit configuration file

crates/{core,adaptive}/**/*.rs: Review the Rust runtime for async correctness, scope isolation, middleware ordering, and event lifecycle regressions.
Pay close attention to task-local/thread-local scope propagation, callback lifetimes, stream finalization, and root_uuid isolation.
Public API changes should preserve existing behavior unless tests and docs show the intended migration path.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}

⚙️ CodeRabbit configuration file

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}: Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.
Prefer assertions on lifecycle events, scope stacks, middleware ordering, and binding parity over shallow smoke tests.

Files:

• crates/core/tests/unit/observability/exporter_parity_tests.rs

🔇 Additional comments (1)

crates/core/tests/unit/observability/exporter_parity_tests.rs (1)

822-880: 📐 Maintainability & Code Quality

Run the required validation before handoff.

The updated assertion matches the shared Relay UUID trace-ID contract. Because this is a Rust change under crates/core, run cargo fmt --all, cargo clippy --workspace --all-targets -- -D warnings, just test-rust, validate-change, the full Rust/Python/Go/Node validation matrix, and uv run pre-commit run --all-files.

Source: Coding guidelines

---

Walkthrough

Relay UUIDs are converted into OpenTelemetry TraceId and SpanId values. OTEL and OpenInference processors apply these identifiers to start, orphan mark, and tool-projected mark spans, with tests covering deterministic IDs, parent linkage, and exporter trace correlation.

Changes

Deterministic OpenTelemetry IDs

Layer / File(s)	Summary
Relay UUID conversion helpers crates/core/src/observability/mod.rs	Adds gated UUID-to-TraceId and UUID-to-SpanId helpers, plus nil-UUID conversion coverage.
Processor span identity wiring crates/core/src/observability/openinference.rs, crates/core/src/observability/otel.rs	Sets Relay-derived trace and span identifiers for lifecycle spans, orphan marks, and tool-projected marks.
Deterministic identity and parity tests crates/core/tests/unit/observability/openinference_tests.rs, crates/core/tests/unit/observability/otel_tests.rs, crates/core/tests/unit/observability/exporter_parity_tests.rs	Uses fixed UUIDs to verify byte-level IDs, child parent linkage, orphan spans, and matching OTEL/OpenInference trace IDs.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant RelayEvent
  participant OtelEventProcessor
  participant OpenInferenceEventProcessor
  participant SpanBuilder
  RelayEvent->>OtelEventProcessor: process_start or process_mark with UUID
  RelayEvent->>OpenInferenceEventProcessor: Start or Mark with UUID
  OtelEventProcessor->>SpanBuilder: set UUID-derived trace_id and span_id
  OpenInferenceEventProcessor->>SpanBuilder: set UUID-derived trace_id and span_id
  SpanBuilder-->>OtelEventProcessor: emit span
  SpanBuilder-->>OpenInferenceEventProcessor: emit span

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Possibly related PRs

• NVIDIA/NeMo-Relay#403: Updates OpenInference tool-projected mark attributes in the same processing path.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows Conventional Commits and accurately summarizes the main observability identifier change.
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[coderabbitai]

Actionable comments posted: 6

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/core/src/observability/mod.rs`:
- Around line 576-589: Remove the inline tests module from observability/mod.rs
and relocate relay_id_conversions_preserve_zero_bytes into
crates/core/tests/unit/observability. Wire the relocated test into the crate
using the existing #[path] inclusion pattern used by openinference_tests.rs,
otel_tests.rs, and related observability tests, preserving access to
relay_trace_id and relay_span_id.

In `@crates/core/src/observability/openinference.rs`:
- Around line 745-746: Update the trace and span ID assignment in the
event-processing flow around relay_trace_id and relay_span_id to preserve the
same precedence behavior required by process_start: ensure relay-derived IDs do
not override the event’s existing IDs when those are already available, while
retaining relay IDs as the fallback.
- Around line 709-710: Update the trace and span ID assignment in the
event-building flow around relay_trace_id and relay_span_id to preserve the same
precedence behavior required by process_start: use the event’s existing IDs when
present and only fall back to relay-derived IDs when absent. Keep the current
builder flow unchanged apart from correcting this precedence.
- Around line 638-639: Update the span-building chain around with_trace_id and
with_span_id to apply relay_trace_id(event.uuid()) only when is_trace_root is
true. Leave child spans without an explicit trace_id so they inherit the parent
trace ID, while preserving the existing root and span ID behavior.

In `@crates/core/src/observability/otel.rs`:
- Around line 703-704: Update the trace and span ID assignment in the
event-processing flow to preserve the intended precedence, matching the
correction applied to otel.rs process_start and openinference.rs. Ensure
relay_trace_id and relay_span_id do not overwrite higher-priority existing
identifiers.
- Around line 731-732: Update the trace and span ID assignment in the
surrounding observability event builder to preserve the intended precedence,
matching the correction applied to openinference.rs and the otel.rs
process_start path. Adjust the .with_trace_id and .with_span_id calls so
relay-derived IDs cannot incorrectly override the intended existing IDs.

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• crates/core/src/observability/mod.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs

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**/*.rs

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

**/*.rs: Any Rust change must run just test-rust
Any Rust change must run cargo fmt --all
Any Rust change must run cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all for all FFI work since it is Rust work
Run just test-rust to validate FFI changes
Run cargo clippy --workspace --all-targets -- -D warnings to enforce strict linting on FFI work

When Rust files changed as part of Go work, also run cargo fmt --all, just test-rust, and cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all when Rust files are changed as part of Node work
Run cargo clippy --workspace --all-targets -- -D warnings when Rust files are changed as part of Node work
Run just test-rust when Rust files are changed as part of Node work

When changing the core Rust runtime or Rust-facing API surface, format Rust code with cargo fmt (rustfmt defaults), keep cargo clippy -- -D warnings clean, and satisfy cargo deny check per deny.toml.

**/*.rs: If any Rust code changed, always run just test-rust.
If any Rust code changed, also run cargo fmt --all.
If any Rust code changed, also run cargo clippy --workspace --all-targets -- -D warnings.
For Rust changes headed for review, run cargo fmt --all and cargo clippy --workspace --all-targets -- -D warnings even if relying on pre-commit.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

{crates/core,crates/adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

Changes to crates/core or crates/adaptive must run the full language matrix

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

crates/core/**/*.rs

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If the change touched crates/core or shared runtime semantics, also use validate-change for broader validation

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

**/*.{rs,py}

📄 CodeRabbit inference engine (AGENTS.md)

Follow binding naming conventions in Rust and Python: use snake_case.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

**/*.{rs,py,js,mjs,cjs,ts,tsx}

📄 CodeRabbit inference engine (AGENTS.md)

**/*.{rs,py,js,mjs,cjs,ts,tsx}: Use Json = serde_json::Value in Rust-facing runtime APIs where the existing code expects JSON payloads.
Use Result<T> with FlowError in core runtime paths, and keep errors explicit and binding-appropriate at the wrapper layer.
Keep async behavior on the existing tokio-based model; bindings should preserve callback and future lifetimes rather than blocking or hiding async work unexpectedly.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

**/*.{rs,py,go,js,ts,c,h}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Use language-appropriate naming conventions: Rust snake_case, C FFI exports prefixed nemo_relay_, Go PascalCase, Node.js camelCase, and Python snake_case.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

**/*.{rs,go,js,ts}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Add the SPDX license header to all Rust, Go, JavaScript, and TypeScript source files using the corresponding // comment form.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

**/*: Format changed files with the language-native formatter before the final lint/test pass.
If dynamic plugin behavior changed, use maintain-dynamic-plugins and include the native SDK, worker protocol, Python SDK, docs, packaging, and Codecov surfaces in the validation plan.
If code changes alter APIs, bindings, commands, paths, packaging behavior, observability/adaptive semantics, or documented best practices, update any dependent maintainer or consumer skills in the same branch.
During iteration, prefer uv run pre-commit run --files <changed files...>.
Before review or handoff, run uv run pre-commit run --all-files.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

crates/{core,adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If crates/core or crates/adaptive changed, run the full validation matrix across Rust, Python, Go, and Node.js.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

**/*.{rs,py,go,js,ts}

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If a language surface changed, always run that language's test target even when Rust core did not change.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

crates/{core,adaptive}/**/*.rs

⚙️ CodeRabbit configuration file

crates/{core,adaptive}/**/*.rs: Review the Rust runtime for async correctness, scope isolation, middleware ordering, and event lifecycle regressions.
Pay close attention to task-local/thread-local scope propagation, callback lifetimes, stream finalization, and root_uuid isolation.
Public API changes should preserve existing behavior unless tests and docs show the intended migration path.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/otel.rs

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}

⚙️ CodeRabbit configuration file

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}: Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.
Prefer assertions on lifecycle events, scope stacks, middleware ordering, and binding parity over shallow smoke tests.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs

{crates/**/src/**/*.rs,python/**/*.py}

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Do not add tests under src; Rust tests belong in crate tests/ trees, and Python SDK tests belong under python/tests.

Files:

• crates/core/src/observability/openinference.rs
• crates/core/src/observability/mod.rs
• crates/core/src/observability/otel.rs

crates/core/src/observability/{atif,otel,openinference}.rs

📄 CodeRabbit inference engine (.agents/skills/maintain-observability/SKILL.md)

When changing the core event model, emitted fields, exporter behavior, subscriber config, or lifecycle, keep the ATIF, OpenTelemetry, and OpenInference implementations in sync.

Files:

• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs

🔇 Additional comments (6)

crates/core/src/observability/mod.rs (1)

75-86: LGTM!

crates/core/src/observability/openinference.rs (1)

28-29: LGTM!

crates/core/src/observability/otel.rs (2)

25-29: LGTM!

---

631-632: 🗄️ Data Integrity & Integration

Keep ATIF aligned with this identity change. If atif.rs has an equivalent event identifier, wire event.uuid() through it too; otherwise make the ATIF exemption explicit.

crates/core/tests/unit/observability/openinference_tests.rs (1)

2364-2374: LGTM!

Solid deterministic coverage of root, child, and orphan derivation with byte-level assertions and parent-linkage checks. As per path instructions, this "prefer[s] assertions on lifecycle events, scope stacks, middleware ordering, and binding parity over shallow smoke tests."

Also applies to: 2404-2416, 2425-2455

Source: Path instructions

crates/core/tests/unit/observability/otel_tests.rs (1)

1052-1062: LGTM!

Also applies to: 1092-1104, 1113-1143

[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/core/src/observability/mod.rs`:
- Around line 75-85: Ensure nil UUIDs are rejected or replaced before they reach
relay_trace_id and relay_span_id, preventing zero-valued OpenTelemetry IDs from
being produced. Add the guard at the event boundary when event UUIDs are
handled, or map nil values to an established non-zero fallback while preserving
normal UUID conversion.

In `@crates/core/tests/unit/observability/openinference_tests.rs`:
- Around line 2366-2370: The orphan-mark tests currently use
MarkProjection::Tool and bypass the normal process_mark path. In
crates/core/tests/unit/observability/openinference_tests.rs at lines 2366-2370,
add a default-projection orphan-mark case using MarkProjection::default() and
assert the Relay-derived trace/span bytes; add the equivalent assertion in
crates/core/tests/unit/observability/otel_tests.rs at lines 1054-1058.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

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📒 Files selected for processing (5)

• crates/core/src/observability/mod.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs

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**/*.rs

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

**/*.rs: Any Rust change must run just test-rust
Any Rust change must run cargo fmt --all
Any Rust change must run cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all for all FFI work since it is Rust work
Run just test-rust to validate FFI changes
Run cargo clippy --workspace --all-targets -- -D warnings to enforce strict linting on FFI work

When Rust files changed as part of Go work, also run cargo fmt --all, just test-rust, and cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all when Rust files are changed as part of Node work
Run cargo clippy --workspace --all-targets -- -D warnings when Rust files are changed as part of Node work
Run just test-rust when Rust files are changed as part of Node work

When changing the core Rust runtime or Rust-facing API surface, format Rust code with cargo fmt (rustfmt defaults), keep cargo clippy -- -D warnings clean, and satisfy cargo deny check per deny.toml.

**/*.rs: If any Rust code changed, always run just test-rust.
If any Rust code changed, also run cargo fmt --all.
If any Rust code changed, also run cargo clippy --workspace --all-targets -- -D warnings.
For Rust changes headed for review, run cargo fmt --all and cargo clippy --workspace --all-targets -- -D warnings even if relying on pre-commit.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

{crates/core,crates/adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

Changes to crates/core or crates/adaptive must run the full language matrix

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

crates/core/**/*.rs

📄 CodeRabbit inference engine (.agents/skills/test-go-binding/SKILL.md)

If the change touched crates/core or shared runtime semantics, also use validate-change for broader validation

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

**/*.{rs,py}

📄 CodeRabbit inference engine (AGENTS.md)

Follow binding naming conventions in Rust and Python: use snake_case.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

**/*.{rs,py,js,mjs,cjs,ts,tsx}

📄 CodeRabbit inference engine (AGENTS.md)

**/*.{rs,py,js,mjs,cjs,ts,tsx}: Use Json = serde_json::Value in Rust-facing runtime APIs where the existing code expects JSON payloads.
Use Result<T> with FlowError in core runtime paths, and keep errors explicit and binding-appropriate at the wrapper layer.
Keep async behavior on the existing tokio-based model; bindings should preserve callback and future lifetimes rather than blocking or hiding async work unexpectedly.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

**/*.{rs,py,go,js,ts,c,h}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Use language-appropriate naming conventions: Rust snake_case, C FFI exports prefixed nemo_relay_, Go PascalCase, Node.js camelCase, and Python snake_case.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

**/*.{rs,go,js,ts}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Add the SPDX license header to all Rust, Go, JavaScript, and TypeScript source files using the corresponding // comment form.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

{crates/**/src/**/*.rs,python/**/*.py}

📄 CodeRabbit inference engine (.agents/skills/maintain-dynamic-plugins/SKILL.md)

Do not add tests under src; Rust tests belong in crate tests/ trees, and Python SDK tests belong under python/tests.

Files:

• crates/core/src/observability/mod.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs

**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

**/*: Format changed files with the language-native formatter before the final lint/test pass.
If dynamic plugin behavior changed, use maintain-dynamic-plugins and include the native SDK, worker protocol, Python SDK, docs, packaging, and Codecov surfaces in the validation plan.
If code changes alter APIs, bindings, commands, paths, packaging behavior, observability/adaptive semantics, or documented best practices, update any dependent maintainer or consumer skills in the same branch.
During iteration, prefer uv run pre-commit run --files <changed files...>.
Before review or handoff, run uv run pre-commit run --all-files.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

crates/{core,adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If crates/core or crates/adaptive changed, run the full validation matrix across Rust, Python, Go, and Node.js.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

**/*.{rs,py,go,js,ts}

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If a language surface changed, always run that language's test target even when Rust core did not change.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

crates/{core,adaptive}/**/*.rs

⚙️ CodeRabbit configuration file

crates/{core,adaptive}/**/*.rs: Review the Rust runtime for async correctness, scope isolation, middleware ordering, and event lifecycle regressions.
Pay close attention to task-local/thread-local scope propagation, callback lifetimes, stream finalization, and root_uuid isolation.
Public API changes should preserve existing behavior unless tests and docs show the intended migration path.

Files:

• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}

⚙️ CodeRabbit configuration file

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}: Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.
Prefer assertions on lifecycle events, scope stacks, middleware ordering, and binding parity over shallow smoke tests.

Files:

• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/tests/unit/observability/openinference_tests.rs

crates/core/src/observability/{atif,otel,openinference}.rs

📄 CodeRabbit inference engine (.agents/skills/maintain-observability/SKILL.md)

When changing the core event model, emitted fields, exporter behavior, subscriber config, or lifecycle, keep the ATIF, OpenTelemetry, and OpenInference implementations in sync.

Files:

• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs

🔇 Additional comments (2)

crates/core/src/observability/mod.rs (2)

576-589: Duplicate: relocate this inline unit test.

As per coding guidelines, “Do not add tests under src; Rust tests belong in crate tests/ trees.”

Source: Coding guidelines

---

75-85: 📐 Maintainability & Code Quality

Run the required crates/core validation matrix.

Please provide successful output for cargo fmt --all, strict Clippy, just test-rust, cargo deny check, validate-change, uv run pre-commit run --all-files, and the Rust/Python/Go/Node matrix. As per coding guidelines, “Changes to crates/core or crates/adaptive must run the full language matrix.”

Source: Coding guidelines

[github-actions]

Fern docs preview: https://nvidia-preview-pull-request-453.docs.buildwithfern.com/nemo/relay (​https://nvidia-preview-pull-request-453.docs.buildwithfern.com/nemo/relay​)

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/core/src/observability/mod.rs`:
- Around line 81-84: Update relay_span_id to guard against UUIDs whose low 64
bits are zero, preventing creation of SpanId::INVALID; make the conversion
reject or return a fallible result and update callers such as with_span_id
accordingly. Also ensure nil UUIDs cannot produce invalid OpenTelemetry context
IDs.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

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Review profile: ASSERTIVE

Plan: Enterprise

Run ID: b6e15c18-6c81-493d-bd23-5f08d52eac53

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Reviewing files that changed from the base of the PR and between 66eeb7e and ddd1abe.

📒 Files selected for processing (5)

• crates/core/src/observability/mod.rs
• crates/core/src/observability/openinference.rs
• crates/core/src/observability/otel.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs

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📓 Path-based instructions (14)

**/*.rs

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

**/*.rs: Any Rust change must run just test-rust
Any Rust change must run cargo fmt --all
Any Rust change must run cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all for all FFI work since it is Rust work
Run just test-rust to validate FFI changes
Run cargo clippy --workspace --all-targets -- -D warnings to enforce strict linting on FFI work

When Rust files changed as part of Go work, also run cargo fmt --all, just test-rust, and cargo clippy --workspace --all-targets -- -D warnings

**/*.rs: Run cargo fmt --all when Rust files are changed as part of Node work
Run cargo clippy --workspace --all-targets -- -D warnings when Rust files are changed as part of Node work
Run just test-rust when Rust files are changed as part of Node work

When changing the core Rust runtime or Rust-facing API surface, format Rust code with cargo fmt (rustfmt defaults), keep cargo clippy -- -D warnings clean, and satisfy cargo deny check per deny.toml.

**/*.rs: If any Rust code changed, always run just test-rust.
If any Rust code changed, also run cargo fmt --all.
If any Rust code changed, also run cargo clippy --workspace --all-targets -- -D warnings.
For Rust changes headed for review, run cargo fmt --all and cargo clippy --workspace --all-targets -- -D warnings even if relying on pre-commit.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

{crates/core,crates/adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)

Changes to crates/core or crates/adaptive must run the full language matrix

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

crates/core/**/*.rs

📄 CodeRabbit inference engine (.agents/skills/test-go-binding/SKILL.md)

If the change touched crates/core or shared runtime semantics, also use validate-change for broader validation

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

**/*.{rs,py}

📄 CodeRabbit inference engine (AGENTS.md)

Follow binding naming conventions in Rust and Python: use snake_case.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

**/*.{rs,py,js,mjs,cjs,ts,tsx}

📄 CodeRabbit inference engine (AGENTS.md)

**/*.{rs,py,js,mjs,cjs,ts,tsx}: Use Json = serde_json::Value in Rust-facing runtime APIs where the existing code expects JSON payloads.
Use Result<T> with FlowError in core runtime paths, and keep errors explicit and binding-appropriate at the wrapper layer.
Keep async behavior on the existing tokio-based model; bindings should preserve callback and future lifetimes rather than blocking or hiding async work unexpectedly.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

**/*.{rs,py,go,js,ts,c,h}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Use language-appropriate naming conventions: Rust snake_case, C FFI exports prefixed nemo_relay_, Go PascalCase, Node.js camelCase, and Python snake_case.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

**/*.{rs,go,js,ts}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Add the SPDX license header to all Rust, Go, JavaScript, and TypeScript source files using the corresponding // comment form.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

{crates/**/src/**/*.rs,python/**/*.py}

📄 CodeRabbit inference engine (.agents/skills/maintain-dynamic-plugins/SKILL.md)

Do not add tests under src; Rust tests belong in crate tests/ trees, and Python SDK tests belong under python/tests.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/src/observability/openinference.rs

crates/core/src/observability/{atif,otel,openinference}.rs

📄 CodeRabbit inference engine (.agents/skills/maintain-observability/SKILL.md)

When changing the core event model, emitted fields, exporter behavior, subscriber config, or lifecycle, keep the ATIF, OpenTelemetry, and OpenInference implementations in sync.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/openinference.rs

**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

**/*: Format changed files with the language-native formatter before the final lint/test pass.
If dynamic plugin behavior changed, use maintain-dynamic-plugins and include the native SDK, worker protocol, Python SDK, docs, packaging, and Codecov surfaces in the validation plan.
If code changes alter APIs, bindings, commands, paths, packaging behavior, observability/adaptive semantics, or documented best practices, update any dependent maintainer or consumer skills in the same branch.
During iteration, prefer uv run pre-commit run --files <changed files...>.
Before review or handoff, run uv run pre-commit run --all-files.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

crates/{core,adaptive}/**/*

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If crates/core or crates/adaptive changed, run the full validation matrix across Rust, Python, Go, and Node.js.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

**/*.{rs,py,go,js,ts}

📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)

If a language surface changed, always run that language's test target even when Rust core did not change.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

crates/{core,adaptive}/**/*.rs

⚙️ CodeRabbit configuration file

crates/{core,adaptive}/**/*.rs: Review the Rust runtime for async correctness, scope isolation, middleware ordering, and event lifecycle regressions.
Pay close attention to task-local/thread-local scope propagation, callback lifetimes, stream finalization, and root_uuid isolation.
Public API changes should preserve existing behavior unless tests and docs show the intended migration path.

Files:

• crates/core/src/observability/otel.rs
• crates/core/src/observability/mod.rs
• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs
• crates/core/src/observability/openinference.rs

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}

⚙️ CodeRabbit configuration file

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}: Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.
Prefer assertions on lifecycle events, scope stacks, middleware ordering, and binding parity over shallow smoke tests.

Files:

• crates/core/tests/unit/observability/openinference_tests.rs
• crates/core/tests/unit/observability/otel_tests.rs

🔇 Additional comments (6)

crates/core/src/observability/mod.rs (2)

577-589: Move this test to the crate test tree.

As per coding guidelines, “Do not add tests under src; Rust tests belong in crate tests/ trees, and Python SDK tests belong under python/tests.”

Source: Coding guidelines

---

75-85: 📐 Maintainability & Code Quality

Provide the required core-runtime validation results.

Run cargo fmt --all, cargo clippy --workspace --all-targets -- -D warnings, just test-rust, cargo deny check, validate-change, and the Rust/Python/Go/Node matrix before handoff.

As per coding guidelines, “If the change touched crates/core or shared runtime semantics, also use validate-change for broader validation” and “If crates/core or crates/adaptive changed, run the full validation matrix across Rust, Python, Go, and Node.js.”

Source: Coding guidelines

crates/core/src/observability/openinference.rs (1)

28-29: LGTM!

Also applies to: 638-639, 709-710, 745-746

crates/core/src/observability/otel.rs (1)

28-29: LGTM!

Also applies to: 631-632, 703-704, 731-732

crates/core/tests/unit/observability/openinference_tests.rs (1)

2372-2455: LGTM!

crates/core/tests/unit/observability/otel_tests.rs (1)

1060-1143: LGTM!

[mnajafian-nv]

Great direction overall. I left two focused comments on the OTLP ID derivation edge case so we can make sure the new exporter contract stays valid for all caller-supplied Relay UUIDs.

[mnajafian-nv]

Thanks, conditional approval. The helper thread still has one suggestion ready for your review.

[willkill07]

/merge