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distributed-tracing

Distributed tracing con OpenTelemetry: setup Go/TS/React/RN, Cloud Trace, Tempo, Datadog, sampling, correlación con logs.

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Distributed Tracing — OpenTelemetry + Cloud Trace

Standard Educabot: OTel SDK + OTLP exporter → Google Cloud Trace (prod), Jaeger local (dev). Siempre OTLP para switchear backend sin tocar código.

Backends

BackendCuándo
Google Cloud TraceDefault (Cloud Run/GKE), factura por span
Grafana TempoSelf-host, budget-conscious, parea con Loki+Grafana
Datadog APMOrg con DD enterprise
HoneycombDebug complejo, high-cardinality BubbleUp
Jaeger OSSDev local / fallback

Setup por Stack

Go (Gin): InitTracing() con Cloud Trace exporter, resource attributes (service.name, deployment.environment), ParentBased(TraceIDRatioBased) sampler, TraceContext+Baggage propagator. Middleware: otelgin.Middleware("service-name"). HTTP client: otelhttp.NewTransport(). DB: otelsql.Open(). Custom span: tracer.Start(ctx, "op") + defer span.End() + span.SetAttributes() + span.RecordError().

Node/TS: NodeSDK con auto-instrumentations (disable fs). Import ANTES que cualquier otro require (--require ./dist/tracing.js). Resource: service.name + environment. Sampler: ParentBased(TraceIDRatioBased(0.1)) prod. Custom span: tracer.startActiveSpan() + try/catch/finally con span.end().

React web: WebTracerProvider + FetchInstrumentation con propagateTraceHeaderCorsUrls. Samplear 1-5% (tráfico browser enorme).

React Native: mismo approach que web, cuidado con bundle size y battery.

Propagación

HTTP: automático con otelhttp/auto-instrumentation (header traceparent). PubSub/Kafka: inject/extract manual en message attributes con MapCarrier.

Sampling

EntornoRateSampler
Dev/staging100%AlwaysSample
Prod10%TraceIDRatioBased(0.1) + ParentBased
Errores/latencia alta100%Tail-based (Collector)

Tail-based requiere OTel Collector intermedio con policies: errors (status_code ERROR), slow (threshold_ms 1000), random (10%).

Correlación con Logs

Incluir trace_id + span_id en cada log line. Cloud Logging: logging.googleapis.com/trace → link directo en Cloud Trace UI.

Errores & Attributes

span.RecordError(err) + span.SetStatus(codes.Error, msg). Attributes OK: user.id, tenant.id, result.count, http.route. NO: email, password, tokens, contenido libre, responses completas de DB.

Link con Bugsnag: incluir trace_id en metadata del error → saltar desde Bugsnag a Cloud Trace.

Anti-patterns

  • Sampling 100% en prod → factura explosiva
  • Sin propagation → spans huérfanos
  • PII en attributes
  • Spans demasiado finos (cada helper) → overhead + ruido
  • Sin correlación con logs
  • Olvidar span.End() → memory leak
  • log.Printf("took %dms") en vez de spans
  • Instrumentar manual lo que auto-instrumentation ya cubre
  • Exportar directo sin Collector → no hay tail sampling ni filtro PII
  • traceparent no propagado en PubSub/Kafka
  • AlwaysSample en React web prod

Checklist

  • SDK OTel inicializado antes de cualquier dependencia
  • service.name + deployment.environment como resource attributes
  • Propagator: TraceContext + Baggage
  • Sampler: ParentBased(TraceIDRatioBased), 10% prod, 100% dev
  • HTTP server middleware (otelgin / auto-instr)
  • HTTP client wrapped (otelhttp / auto-instr)
  • DB driver wrapped (otelsql / Prisma instr)
  • PubSub/Kafka: inject/extract manual de traceparent
  • Logs incluyen trace_id + span_id
  • span.RecordError + SetStatus(Error) en paths de error
  • Shutdown limpio en SIGTERM
  • Sin PII en attributes (grep email|password|token)
  • Frontend samplea <=5%
  • Collector intermedio para tail-sampling en prod

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