feat: record provider request and response sizes - #712
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WalkthroughThe gateway emits ChangesProvider body-size telemetry
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Client
participant Gateway
participant Provider
participant Telemetry
Client->>Gateway: Send request
Gateway->>Telemetry: Emit gateway.provider.request with body_size_bytes
Gateway->>Provider: Forward effective request
Provider-->>Gateway: Return buffered or streamed response
Gateway->>Telemetry: Emit gateway.provider.response with body_size_bytes
Gateway-->>Client: Return response
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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🤖 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/cli/tests/coverage/shared/gateway_tests.rs`:
- Around line 1146-1158: Update the subscriber setup in the gateway provider
request body-size test to prevent unrelated concurrent requests from overwriting
captured_data: either filter callback events by a request-specific identifier
tied to this test or serialize the test so no other request can trigger the
global subscriber during capture. Preserve capturing the intended
gateway.provider.request event before assertion.
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🧠 Learnings (1)
📚 Learning: 2026-08-03T19:55:03.931Z
Learnt from: afourniernv
Repo: NVIDIA/NeMo-Relay PR: 558
File: crates/pii-redaction/src/rampart/mod.rs:265-274
Timestamp: 2026-08-03T19:55:03.931Z
Learning: In NeMo Relay first-party plugin registration helpers, treat the documented duplicate-registration `PluginError::RegistrationFailed` result from `register_plugin` as success when registration is intended to be idempotent. Do not locally reclassify this as `PluginError::Conflict`; changing the classification requires a core-wide review of the public API and FFI behavior.
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🔇 Additional comments (3)
crates/cli/src/gateway/mod.rs (1)
807-812: LGTM!crates/cli/tests/coverage/shared/gateway_tests.rs (1)
1195-1199: LGTM!Also applies to: 1218-1223
docs/nemo-relay-cli/basic-usage.mdx (1)
52-56: 📐 Maintainability & Code QualityVerify the JSON re-encoding wording.
forward_upstream_requestmeasureseffective.body_bytes, buteffective_dispatch_requestreturns the originalbody_byteswheneffective_requestisNoneorreencode_request_bodyreturnsNone(Lines [875-880] incrates/cli/src/gateway/mod.rs). The current sentence implies that every request is JSON-reencoded.Confirm that these fallback paths are unreachable for gateway requests. Otherwise, describe the field as the effective upstream body size after any applicable interception or re-encoding.
Possible wording adjustment
- exact `body_size_bytes` after request interceptors and JSON re-encoding, + exact effective upstream body size in `body_size_bytes` after any applicable request interception and JSON re-encoding,As per path instructions, documentation changes must be technically accurate against the current API.
Source: Path instructions
Signed-off-by: Benjamin Klieger <bklieger@nvidia.com>
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crates/cli/src/gateway/mod.rs (1)
622-627: 🎯 Functional Correctness | 🟠 Major | ⚡ Quick winEmit response-size telemetry before terminal stream errors.
client_sse_bodystops polling after an error, sodecoder.finish()errors skip the post-match emission. A passthrough body can also be dropped after yielding an error, so its post-loop emission is not reliable.Emit before each terminal error, then return. Add tests for an incomplete SSE frame and a passthrough transport error.
🤖 Prompt for 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. In `@crates/cli/src/gateway/mod.rs` around lines 622 - 627, Update the gateway streaming error paths in client_sse_body and the passthrough body flow: emit provider response-size telemetry immediately before each terminal error is yielded, then return so execution cannot skip the emission. Do not rely on post-match or post-loop emission; add coverage for an incomplete SSE frame and a passthrough transport error.Sources: Path instructions, MCP tools
🤖 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.
Outside diff comments:
In `@crates/cli/src/gateway/mod.rs`:
- Around line 622-627: Update the gateway streaming error paths in
client_sse_body and the passthrough body flow: emit provider response-size
telemetry immediately before each terminal error is yielded, then return so
execution cannot skip the emission. Do not rely on post-match or post-loop
emission; add coverage for an incomplete SSE frame and a passthrough transport
error.
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📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)
If links in documentation change, run
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Keep package names, repository references, and build commands current.
Contribution workflow documentation must require an issue before external contribution pull requests and note that NVIDIA contributors may use a GitHub or Linear issue.
Update entry-point documentation when examples or reading paths change.
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Examples and documentation must use each exporter's documented flush/deregister order before shutdown.
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docs/**/*.{md,mdx}
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Update relevant reference documentation when public behavior or APIs change.
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**/*.{md,mdx,rst}
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Format code elements, commands, parameters, package names, expressions, directories, file names, and paths in monospace; represent path placeholders with angle brackets inside monospace.
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Format definition lists with a bold term followed by a complete, parallel, punctuated definition.
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Write procedure steps as imperative ...
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{docs/**,README.md,CONTRIBUTING.md,RELEASING.md,SECURITY.md}
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{docs/**,README.md,CONTRIBUTING.md,RELEASING.md,SECURITY.md}: Review documentation for technical accuracy against the current API, command correctness, and consistency across language bindings.
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📄 CodeRabbit inference engine (CONTRIBUTING.md)
When adding functionality, include tests in the appropriate test files for each affected language binding.
Files:
crates/cli/tests/coverage/shared/gateway_tests.rs
{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}
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crates/cli/tests/coverage/shared/gateway_tests.rs
🧠 Learnings (1)
📚 Learning: 2026-08-03T19:55:03.931Z
Learnt from: afourniernv
Repo: NVIDIA/NeMo-Relay PR: 558
File: crates/pii-redaction/src/rampart/mod.rs:265-274
Timestamp: 2026-08-03T19:55:03.931Z
Learning: In NeMo Relay first-party plugin registration helpers, treat the documented duplicate-registration `PluginError::RegistrationFailed` result from `register_plugin` as success when registration is intended to be idempotent. Do not locally reclassify this as `PluginError::Conflict`; changing the classification requires a core-wide review of the public API and FFI behavior.
Applied to files:
crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
🔇 Additional comments (3)
crates/cli/src/gateway/mod.rs (2)
185-185: LGTM!Also applies to: 372-372, 568-568, 599-616
815-846: 📐 Maintainability & Code QualityComplete the required validation before handoff.
The changed files require Rust, documentation, and repository-wide validation. The PR context reports that some checks were blocked by unavailable
justand an older local Rust version.
crates/cli/src/gateway/mod.rs#L815-L846: Runcargo fmt --all,cargo clippy --workspace --all-targets -- -D warnings, andjust test-rustin the repository-supported environment.docs/nemo-relay-cli/basic-usage.mdx#L52-L57: Runjust docs.crates/cli/src/gateway/mod.rs#L815-L846anddocs/nemo-relay-cli/basic-usage.mdx#L52-L57: Runuv run pre-commit run --all-filesbefore handoff.Source: Coding guidelines
crates/cli/tests/coverage/shared/gateway_tests.rs (1)
977-989: LGTM!Also applies to: 1025-1030, 1165-1184, 1221-1225, 1244-1254
Signed-off-by: Benjamin Klieger <bklieger@nvidia.com>
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Actionable comments posted: 1
Caution
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⚠️ Outside diff range comments (1)
crates/cli/src/gateway/mod.rs (1)
599-631: 🗄️ Data Integrity & Integration | 🟠 Major | 🏗️ Heavy liftEmit response telemetry when a downstream consumer drops a stream.
Both streams skip
gateway.provider.responsewhen cancellation occurs after a yielded chunk. Add a drop-safe guard forsse_json_streamandpassthrough_streaming. Ensure the guard emits exactly once and does not duplicate EOF or error-path events. Add cancellation tests for both streams.🤖 Prompt for 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. In `@crates/cli/src/gateway/mod.rs` around lines 599 - 631, The sse_json_stream and passthrough_streaming generators omit gateway.provider.response telemetry when a downstream consumer drops the stream. Add a drop-safe, once-only emission guard to both stream implementations, mark it completed on normal EOF and existing error paths, and ensure cancellation-triggered cleanup emits only when no prior emission occurred; add cancellation tests covering both streams.
🤖 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/cli/tests/coverage/shared/gateway_tests.rs`:
- Around line 1041-1045: Isolate global subscriber capture in both gateway tests
by updating the callbacks at
crates/cli/tests/coverage/shared/gateway_tests.rs:1041-1045 and :1089-1093 to
accept only each test’s unique event identifier, or serialize subscriber access.
Preserve the existing response-event capture and assertions while ensuring
concurrent requests cannot overwrite another test’s captured body size; include
cross-request isolation coverage.
---
Outside diff comments:
In `@crates/cli/src/gateway/mod.rs`:
- Around line 599-631: The sse_json_stream and passthrough_streaming generators
omit gateway.provider.response telemetry when a downstream consumer drops the
stream. Add a drop-safe, once-only emission guard to both stream
implementations, mark it completed on normal EOF and existing error paths, and
ensure cancellation-triggered cleanup emits only when no prior emission
occurred; add cancellation tests covering both streams.
🪄 Autofix
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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crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
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📓 Path-based instructions (13)
**/*.rs
📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)
**/*.rs: Any Rust change must runjust test-rust
Any Rust change must runcargo fmt --all
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**/*.rs: Runcargo fmt --allfor all FFI work since it is Rust work
Runjust test-rustto validate FFI changes
Runcargo clippy --workspace --all-targets -- -D warningsto enforce strict linting on FFI workWhen Rust files changed as part of Go work, also run
cargo fmt --all,just test-rust, andcargo clippy --workspace --all-targets -- -D warnings
**/*.rs: Runcargo fmt --allwhen Rust files are changed as part of Node work
Runcargo clippy --workspace --all-targets -- -D warningswhen Rust files are changed as part of Node work
Runjust test-rustwhen Rust files are changed as part of Node work
**/*.rs: If any Rust code changed, always runjust test-rust.
If any Rust code changed, also runcargo fmt --all.
If any Rust code changed, also runcargo clippy --workspace --all-targets -- -D warnings.
For Rust changes headed for review, runcargo fmt --allandcargo clippy --workspace --all-targets -- -D warningseven if relying on pre-commit.
**/*.rs: Format Rust code with rustfmt defaults usingcargo fmt.
Runcargo clippy -- -D warnings; all Rust warnings must be treated as errors.
Use Rustsnake_casenaming conventions.
Files:
crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_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 cratetests/trees, and Python SDK tests belong underpython/tests.
Files:
crates/cli/src/gateway/mod.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, usemaintain-dynamic-pluginsand 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, preferuv run pre-commit run --files <changed files...>.
Before review or handoff, runuv run pre-commit run --all-files.
**/*: Use release tags in raw Rust-compatible SemVer without a leadingv; tags such asv0.1.0are prohibited.
Use branch prefixesfeat/,fix/,docs/,test/, orrefactor/according to the change purpose.
Every commit in a pull request must include a DCOSigned-off-by:sign-off.
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crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
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If a language surface changed, always run that language's test target even when Rust core did not change.
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Require every OpenTelemetry endpoint to have a type and nonblank destination; resolveheader_envvalues at activation and reject missing, blank, or duplicate headers.
Concatenate layered ATOF sink, ATIF storage, and OpenTelemetry endpoint lists with higher-precedence entries first.
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Run affected Rust tests andjust test-rustwhen event fields change; runjust test-python,just test-go, andjust test-nodewhen binding-native configuration or lifecycle changes.
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crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
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Add tests covering registration and duplicate names, deregistration and missing names, priority ordering, callback failure policy, scope-local inheritance and cleanup, event payload semantics, immutable mark and scope fields, and parity across affected bindings.
Files:
crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
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Use
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crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
crates/**/*.rs
📄 CodeRabbit inference engine (AGENTS.md)
crates/**/*.rs: UseJson = serde_json::Valuein Rust-facing runtime APIs where existing code expects JSON payloads.
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crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
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Preserve the existing Tokio-based asynchronous model and callback/future lifetimes; do not unexpectedly block or hide async work in bindings.
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Include the appropriate SPDX copyright and Apache-2.0 license header in every source file.
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**/{test,tests}/**/*
📄 CodeRabbit inference engine (CONTRIBUTING.md)
When adding functionality, include tests in the appropriate test files for each affected language binding.
Files:
crates/cli/tests/coverage/shared/gateway_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/cli/tests/coverage/shared/gateway_tests.rs
🧠 Learnings (1)
📚 Learning: 2026-08-03T19:55:03.931Z
Learnt from: afourniernv
Repo: NVIDIA/NeMo-Relay PR: 558
File: crates/pii-redaction/src/rampart/mod.rs:265-274
Timestamp: 2026-08-03T19:55:03.931Z
Learning: In NeMo Relay first-party plugin registration helpers, treat the documented duplicate-registration `PluginError::RegistrationFailed` result from `register_plugin` as success when registration is intended to be idempotent. Do not locally reclassify this as `PluginError::Conflict`; changing the classification requires a core-wide review of the public API and FFI behavior.
Applied to files:
crates/cli/src/gateway/mod.rscrates/cli/tests/coverage/shared/gateway_tests.rs
🔇 Additional comments (1)
crates/cli/src/gateway/mod.rs (1)
599-603: 🗄️ Data Integrity & IntegrationVerify that
body_size_bytescounts provider wire bytes.
bytes_stream()can expose decompressed response bytes when the configuredreqwestclient enables response decompression. The counter would then report decoded bytes, not the exact bytes exchanged with the provider. Reqwest documents automatic response decompression for enabled compression features. (docs.rs)Inspect the
state.httpclient configuration and Cargo features. Add compressed-response coverage. Count before decoding, or revise the metric contract if decoded size is intentional.Also applies to: 1138-1143
| Arc::new(move |event| { | ||
| if event.name() == "gateway.provider.response" { | ||
| *captured.lock().unwrap() = event.data().cloned(); | ||
| } | ||
| }), |
There was a problem hiding this comment.
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Isolate global subscriber capture in both tests.
Each callback accepts every gateway.provider.response event and overwrites the captured value. Concurrent gateway tests can therefore make either assertion inspect another request’s body size.
crates/cli/tests/coverage/shared/gateway_tests.rs#L1041-L1045: filter on a test-specific event identifier, or serialize access to the global subscriber.crates/cli/tests/coverage/shared/gateway_tests.rs#L1089-L1093: apply the same isolation mechanism.
As per path instructions, tests must cover “cross-request isolation where relevant.”
📍 Affects 1 file
crates/cli/tests/coverage/shared/gateway_tests.rs#L1041-L1045(this comment)crates/cli/tests/coverage/shared/gateway_tests.rs#L1089-L1093
🤖 Prompt for 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.
In `@crates/cli/tests/coverage/shared/gateway_tests.rs` around lines 1041 - 1045,
Isolate global subscriber capture in both gateway tests by updating the
callbacks at crates/cli/tests/coverage/shared/gateway_tests.rs:1041-1045 and
:1089-1093 to accept only each test’s unique event identifier, or serialize
subscriber access. Preserve the existing response-event capture and assertions
while ensuring concurrent requests cannot overwrite another test’s captured body
size; include cross-request isolation coverage.
Source: Path instructions
Overview
Record the exact HTTP request and response body sizes exchanged between the gateway and each inference provider in exported OpenTelemetry traces.
Details
gateway.provider.requestimmediately before upstream dispatch, after request interceptors and provider JSON re-encoding.gateway.provider.responseafter reading buffered response bodies and while counting raw streaming chunks before SSE decoding.body_size_bytesin both events.Validation:
cargo fmt --all -- --checkPYO3_PYTHON=.venv/bin/python cargo clippy --workspace --all-targets -- -D warningscargo test -p nemo-relay-cli gateway::tests(71 passed)cargo test -p nemo-relay-cli provider_response_body_size(2 passed)uv run pre-commit run --all-files: formatting, hygiene, Python, docs-link, Clippy, FFI, Go, and Node hooks passed. Environment-only blockers were missingjust,cargo-deny, andcargo-about, plus local Rust 1.96.0 being older than the repository-pinned 1.96.1.just test-rustwas not available becausejustis not installed in the local environment. A direct full CLI run reached 1,065 passing tests; 135 environment/configuration tests failed under the raw parallel Cargo runner.Where should the reviewer start?
Start with
emit_provider_body_sizeand its buffered/streaming call sites incrates/cli/src/gateway/mod.rs, then review the buffered and streaming assertions incrates/cli/tests/coverage/shared/gateway_tests.rs.Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)
Summary by CodeRabbit
New Features
Documentation