feat(browser): OTel logs pipeline, MapleBrowser.logger and per-session trace sampling - #1145
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…n trace sampling
Adds the logs signal to the browser SDK and a way to sample traces.
- MapleBrowser.logger.{debug,info,warn,error} writes OpenTelemetry log
records, linked to the active span and stamped with session.id/user.id.
Records queue in a small eager module; the OTel LoggerProvider and OTLP
exporter live in a new deferred chunk that init() imports right away, so
the logs SDK stays off the eager bundle.
- tracing.sampleRate samples traces per session (FNV hash of session.id),
so a sampled session keeps every trace and its replay never links to a
dropped one. Sampled roots carry the W3C ot=th threshold, which ingest
already turns into the SampleRate weight. Remote parents are followed.
- Error spans from captureException and the global handlers are always
exported, detached from an unsampled parent so they are not orphans.
- The size script reports the deferred chunk on its own line. Eager budget
38 -> 41 kB and first-party 14.5 -> 16 kB for the sampler and log queue.
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe browser SDK adds configurable per-session trace sampling and structured logging. Log records can queue before initialization and export through a deferred OTLP pipeline. The bundle-size report separates deferred chunks from replay chunks and applies a deferred-size budget. ChangesBrowser telemetry
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant BrowserLogger
participant Init
participant DeferredLogs
participant LogQueue
participant OTLPExporter
BrowserLogger->>LogQueue: emitLog record
Init->>DeferredLogs: startDeferred after import
DeferredLogs->>LogQueue: attach sink and drain pending records
LogQueue->>OTLPExporter: forward records
OTLPExporter->>OTLPExporter: filter records by consent and grant time
Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The new logging and sampling paths warrant design review. Consent is checked before logs are exported, but queued logs can outlive an SDK instance, log content does not receive the existing URL privacy treatment, and some failed operations can be lost when traces are sampled out. The exposure depends on how applications use and reinitialize the SDK. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
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✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/browser-sdk.md:
- Line 348: Narrow the error-export guarantee in the docs and the sampleRate
description in the config documentation to standalone exception spans; do not
imply that errors recorded by unsampled MapleBrowser.traced() operations are
exported.
Review comments at @packages/browser/src/sampling.ts:
- Line 69: Update SessionSampler’s traceState so ot=th is accompanied by an
ot=rv randomness value derived from the same sessionRoll decision, ensuring
downstream probability samplers preserve the session sampling decision; if that
value cannot be propagated, omit ot=th.
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docs/browser-sdk.mdpackages/browser/README.mdpackages/browser/package.jsonpackages/browser/scripts/size.tspackages/browser/src/config.tspackages/browser/src/deferred/index.tspackages/browser/src/deferred/logs.tspackages/browser/src/errors.tspackages/browser/src/index.tspackages/browser/src/init.tspackages/browser/src/logger.tspackages/browser/src/logs.browser.test.tspackages/browser/src/logs.tspackages/browser/src/navigation.test.tspackages/browser/src/sampling.test.tspackages/browser/src/sampling.tspackages/browser/src/tracing.browser.test.tspackages/browser/src/tracing.ts
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…e a traced failure - Sampled roots now carry ot=rv next to ot=th, derived from the same session roll, and the decision is rv >= th. A downstream consistent-probability sampler reaches the same answer instead of re-deciding from the trace id. - A failure inside traced() in an unsampled session was recorded on a span that is never exported. It is now reported as its own kept exception span, so "error spans are always exported" holds for traced() too; the shared dedupe still makes a later captureException a no-op.
Maple reviewConfidence 3/5 · needs attention Warning This review ended early; what follows is what it established. Adds an OTel logs pipeline behind
What was checked
Observability coverage: 2 of 2 changes observable
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Part 1 of the browser SDK extension stack. Everything stays OpenTelemetry-native: new signals leave the page as OTLP, and new event-shaped data uses log records rather than span events.
What changes
Logs signal +
MapleBrowser.loggerMapleBrowser.logger.{debug,info,warn,error}(message, attributes)writes OTel log records, linked to the active span and stamped withsession.id/user.id.src/logs.ts, bounded at 200). TheLoggerProviderand OTLP log exporter live in a new deferred chunk (src/deferred/) thatinit()imports right away, so the logs SDK (~5 kB) stays off the eager bundle.tracing.sampleRatesession.id), so a sampled session keeps every trace and its replay never links to a dropped one.ot=th:threshold intracestate; ingest already turns that into theSampleRateweight (docs/sampling-throughput.md), so request counts stay realistic.traceparent) are followed.captureExceptionand the global handlers are always exported, detached from an unsampled parent so they are not orphans.Size script
init()).Testing
bunx vitest runinpackages/browser: sampler unit tests (threshold encoding round-trips through ingest's weight formula, per-session stability, parent following, kept contexts), plus browser tests that exercise the realinit()→ deferred chunk → exporter path, including pre-init queueing, consent gating and sampling end to end.bun run typecheck,bun run size, oxlint.Stack
Review and merge in order; each PR is based on the one before it.
MapleBrowser.logger, per-session trace samplingbrowser.web_vitallog events@maple-dev/browser/react: error boundary and router adaptersreplay.onErrorSampleRate)feat(browser): headless user feedback API #1155 headless user feedback API(dropped)Summary by CodeRabbit
New Features
debug,info,warn, anderrorlevels, including support for attributes and correlation with active spans and sessions.Documentation
Bug Fixes