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feat(vanity-gateway): label the origin of non-2xx responses - #2328
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Extend gateway_proxy_outcome with gateway_rejected (gateway-local rejections) and upstream_status (non-2xx passthrough from the upstream, including rewritten 429s), alongside the existing client_canceled and gateway_proxy_error values. The value is recorded on the inbound server request metric and as the gateway.proxy.outcome span attribute. Status codes and bodies are unchanged. Non-2xx responses also carry an additive NVCF-Error-Source header with the same value. Any copy sent by the upstream is stripped first. The reserved-header guard runs ahead of the server telemetry middleware, so its rejection is now served through that middleware to reach the server metric. Closes #2327 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: jcameron <jcameron@nvidia.com>
Shadow replays share the primary request's metric labeler and span, so their errors were recorded as outcomes on the primary response. Skip outcome recording for requests carrying the shadow header. Relates to #2327 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: jcameron <jcameron@nvidia.com>
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Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review. 📝 WalkthroughWalkthroughThe vanity gateway now records covered non-2xx response origins in server metrics and spans. It adds matching ChangesGateway response outcomes
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Client
participant VanityGateway
participant Upstream
participant Telemetry
Client->>VanityGateway: Send request
VanityGateway->>Upstream: Proxy request
Upstream-->>VanityGateway: Return response
VanityGateway->>VanityGateway: Label covered non-2xx response
VanityGateway-->>Client: Return response with status and body
VanityGateway->>Telemetry: Record outcome on metric and span
Merge Risk: ⚪ Minimal · up to Reserved-header rejections now emit their own structured warning log, and response statuses and bodies are unchanged. No merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation Issue Full details: Docstring CoverageExplanation Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 12 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Review comments at @src/invocation-plane-services/vanity-gateway/gateway/h2.go:
- Line 114: Update RejectSpoofedShadowRequests to emit a structured log when it
rejects a request before the downstream chimiddleware.Logger can run, including
request, function, cluster, and org identifiers where available.
Review comments at @src/invocation-plane-services/vanity-gateway/README.md:
- Line 540: Qualify the non-2xx `NVCF-Error-Source` statement in the README to
cover only response paths that attach the header, and revise the outcome
description so a missing header does not imply success. Preserve the existing
documented header value.
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src/invocation-plane-services/vanity-gateway/README.mdsrc/invocation-plane-services/vanity-gateway/gateway/BUILD.bazelsrc/invocation-plane-services/vanity-gateway/gateway/error_origin_test.gosrc/invocation-plane-services/vanity-gateway/gateway/h2.gosrc/invocation-plane-services/vanity-gateway/gateway/llm_gateway_director.gosrc/invocation-plane-services/vanity-gateway/gateway/openai_director.gosrc/invocation-plane-services/vanity-gateway/gateway/tracing_attrs.gosrc/invocation-plane-services/vanity-gateway/gateway/vanity_director.gosrc/invocation-plane-services/vanity-gateway/gateway/vanity_director_test.gosrc/invocation-plane-services/vanity-gateway/middleware/middleware.gosrc/invocation-plane-services/vanity-gateway/middleware/shadow_guard.gosrc/invocation-plane-services/vanity-gateway/middleware/shadow_guard_test.go
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FamousDirector
enabled auto-merge
October 6, 2026 22:18
…r docs The reserved-header guard runs before the request logger, so its rejections had no log line. Emit a structured warning with trace IDs, method, path and remote address, and never the header value. Qualify the README: only labeled responses carry NVCF-Error-Source, and a missing label or header does not mean success or an upstream origin. Relates to #2327 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: jcameron <jcameron@nvidia.com>
Max-NV
approved these changes
Oct 6, 2026
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🎉 This PR is included in src/invocation-plane-services/vanity-gateway/v1.37.0 🎉 The release is available on GitHub release Your semantic-release bot 📦🚀 |
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TL;DR
Label the origin of non-2xx vanity-gateway responses on the server request metric so availability SLOs can separate gateway-local rejections, dependency-caused gateway errors, and upstream passthrough. Also stop shadow replays from recording outcomes on the primary request. Status codes and bodies are unchanged.
Additional Details
gateway_proxy_outcomegainsgateway_rejected(gateway-local rejections: offline 503, EOL 410, reserved-header 400, OpenAI/Messages validation 400/404/500, polling 404) andupstream_status(any non-2xx from the upstream, including rewritten 429). The existingclient_canceledandgateway_proxy_errorvalues are kept.http_server_request_duration_secondsand as thegateway.proxy.outcomespan attribute through one helper,RecordGatewayProxyOutcome.NVCF-Error-Sourceheader with the same value. Any upstream copy is stripped, including on 2xx.unknown); position in the chain and response are unchanged.upstream_statustoo. The 500 on a response-encode failure afterWriteHeader(200)is not labeled because the recorded status stays 200.client_canceledorgateway_proxy_erroron unrelated statuses (shadow pollution) will stop appearing.For the Reviewer
gateway/vanity_director.go:requestProxy,markGatewayRejected,markUpstreamResponse, shadow skip inaddGatewayProxyOutcome.middleware/shadow_guard.go: guard now takes an observe middleware.RejectSpoofedShadowRequestsgained a second parameter (nil is allowed).For QA
bazel test //src/invocation-plane-services/vanity-gateway/... --test_output=errorspasses;git diff --checkis clean.gateway/error_origin_test.gocovers each group through the real otelhttp middleware (metric, span, header), header spoofing, and shadow replays.Issues
Closes #2327
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