xk6-output-opentelemetry

A k6 output extension that exports metrics, traces, and W3C Baggage to any OTLP-compatible backend.

graph LR
    k6["k6 Load Test"] -->|"metrics (OTLP)"| Collector["OTel Collector"]
    k6 -->|"traces (OTLP)"| Collector
    k6 -->|"HTTP + traceparent + baggage"| App["Your Application"]
    App -->|"traces (OTLP)"| Collector
    Collector --> Backend["Jaeger / Grafana / Dynatrace"]

Key Features

Feature	Description
Metrics	All k6 built-in metrics as OTel counters, gauges, histograms
Traces	Per-iteration, per-request, per-check spans with full attributes
W3C Baggage	Injects k6.test.* metadata on outgoing HTTP requests
JS API	import otel from "k6/x/otel" for custom baggage and attributes
Dual protocol	gRPC and HTTP OTLP export

Quick Start

# Build k6 with the extension
xk6 build v1.6.1 --with github.com/henrikrexed/henrikrexed-xk6-output-opentelemetry

# Run with OTel output
K6_OTEL_GRPC_EXPORTER_INSECURE=true \
K6_OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317 \
./k6 run --out opentelemetry test.js