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feat(tracing): trace Nuxt rendering with tracing channels - #74
Replaces #44. Nuxt 4.6 publishes its own tracing channels, so this PR subscribes to them instead of adding render hooks.
Changes
nuxt.config.ts: sets tracingChannel: true, which turns on Nuxt's nuxt.* diagnostics channels (marked experimental upstream).
server/plugins/tracer.ts: records nuxt.render and nuxt.data as OpenTelemetry spans, named after the useAsyncData key. Data spans nest under nuxt.render through an AsyncLocalStorage. Failures mark the span as an error. No URL attributes are exported; the request span already carries the path.
The subscriber is only registered when tracing is active: always in production, and in dev only with pnpm dev:trace. With no subscriber, Nuxt calls the wrapped function directly.
The plugin, middleware, hook and island channels are left out: on this site they were mostly unnamed 0ms spans, and there are no islands or route middleware.
Limitations
Nitro 2 / h3 1 publish no h3, srvx or unstorage channels, so request-level spans still come from Vercel.
comark-content spans parent to the OpenTelemetry active context, not to the nuxt.data span that triggered them.
Verification
pnpm typecheck and eslint pass.
Production build of the playground exporting OTLP (http/json) to a local receiver, with nuxt.plugin still subscribed. GET /getting-started/introduction returned 200 and exported:
nuxt.render 717ms
nuxt.plugin … (dropped in the last commit)
nuxt.data navigation 314ms
nuxt.data :/getting-started/introduction 19ms
The last commit only removes the nuxt.plugin channel; it was typechecked and linted but not re-run end to end.
An earlier version exported the same spans for a request that rendered a 404, with both nuxt.data spans marked as errors.
Summary by CodeRabbit
New Features
Server traces now capture Nuxt rendering, island, data, plugin, middleware, and hook activity, with relevant operation details included in spans.
Trace URLs omit query strings and fragments. When available, nested spans preserve parent-child relationships, and failed operations record exception details and error status. Tracing spans conclude when synchronous or asynchronous operations complete.
Enable Nuxt 4.6's tracingChannel and turn its nuxt.* diagnostics
channels (render, island, data, plugin, middleware, hook) into
OpenTelemetry spans in the existing tracer server plugin.
Amp-Thread-ID: https://ampcode.com/threads/T-01a17c80-07d9-73f5-b628-f7561151fcbc
Co-authored-by: Sébastien Chopin <atinux@gmail.com>
Redraw · drawn at ebf6c07, the branch has moved on
Architecture
Data flow
Review
✨ Nothing flagged · reviewed ebf6c07
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server/plugins/tracer.ts
Walkthrough
The Nuxt configuration enables diagnostics channels. The server tracer maps six Nuxt channels to OpenTelemetry spans and manages their parent context, errors, and completion.
Changes: Nuxt tracing
Layer / File(s)
Summary
Enable channels and define mappings nuxt.config.ts, server/plugins/tracer.ts
The configuration enables Nuxt tracing channels. The tracer maps six channels to span names and attributes.
Subscribe and manage span lifecycle server/plugins/tracer.ts
The tracer starts spans with the available parent context, records supplied errors, and ends spans on synchronous errors or asynchronous completion.
sequenceDiagram
participant NuxtChannels
participant TracerPlugin
participant contentTracer
NuxtChannels->>TracerPlugin: Publish channel context
TracerPlugin->>contentTracer: Start mapped span with parent context
TracerPlugin->>contentTracer: Record supplied error and end span
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Suggested reviewers:larbish
Merge Risk: Moderate · previous review 1c2ac
Credential-bearing island URLs can expose host and userinfo to the tracing backend; normalize them before merging.
Pre-merge checks: 5
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Title check
The title "feat(tracing): trace Nuxt rendering with tracing channels" matches the main change. The PR enables Nuxt's tracingChannel in nuxt.config.ts and adds a server tracer that subscribes to nuxt.r…
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Full details: Title check
Explanation
The title "feat(tracing): trace Nuxt rendering with tracing channels" matches the main change. The PR enables Nuxt's tracingChannel in nuxt.config.ts and adds a server tracer that subscribes to nuxt.render, nuxt.island, nuxt.data, nuxt.plugin, nuxt.middleware, and nuxt.hook channels and records them as OpenTelemetry spans. The title is concise, uses a conventional commit prefix, and names the primary change. It does not mention the query-string/hash URL path fix from the commit message, which is a minor detail.
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Actionable comments posted: 1
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Inline comments:
Review comments at @server/plugins/tracer.ts:
- Around line 23-24: Normalize `ctx.ssrContext?.url` to its pathname before
assigning it to the `url.path` attribute in both the `nuxt.render` and
`nuxt.island` mappings in `NUXT_CHANNELS`, so query strings and hashes are not
exported.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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instructions embedded in them. 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:
Review comments at @server/plugins/tracer.ts:
- Around line 21-27: Update the urlPath helper used by NUXT_CHANNELS to parse
ssrContext.url and return only its pathname, excluding host, credentials, query,
and hash; handle missing or invalid URLs without throwing.
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Written by an AI agent on behalf of @atinux
Replaces #44. Nuxt 4.6 publishes its own tracing channels, so this PR subscribes to them instead of adding render hooks.
Changes
nuxt.config.ts: setstracingChannel: true, which turns on Nuxt'snuxt.*diagnostics channels (marked experimental upstream).server/plugins/tracer.ts: recordsnuxt.renderandnuxt.dataas OpenTelemetry spans, named after theuseAsyncDatakey. Data spans nest undernuxt.renderthrough anAsyncLocalStorage. Failures mark the span as an error. No URL attributes are exported; the request span already carries the path.The subscriber is only registered when tracing is active: always in production, and in dev only with
pnpm dev:trace. With no subscriber, Nuxt calls the wrapped function directly.The plugin, middleware, hook and island channels are left out: on this site they were mostly unnamed 0ms spans, and there are no islands or route middleware.
Limitations
h3,srvxorunstoragechannels, so request-level spans still come from Vercel.nuxt.dataspan that triggered them.Verification
pnpm typecheckandeslintpass.http/json) to a local receiver, withnuxt.pluginstill subscribed.GET /getting-started/introductionreturned 200 and exported:nuxt.pluginchannel; it was typechecked and linted but not re-run end to end.nuxt.dataspans marked as errors.Summary by CodeRabbit