Examples

The workspace contains runnable examples rather than embedding a second copy of their source in this book.

Basic Axum service

examples/otel initializes Logger from LOG_*, adds request ID middleware, and composes the three axum-otel callbacks.

cargo run -p axum-otel-demo

Without an OTLP endpoint, providers stay local-only. To export all supported signals to a local collector:

export OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317
export OTEL_EXPORTER_OTLP_PROTOCOL=grpc
cargo run -p axum-otel-demo

The service listens on 0.0.0.0:8080; call /hello for an instrumented route or /health for the simple health route.

Microservices demonstration

examples/microservices contains users and articles services, outbound Reqwest tracing, request ID propagation, and a Grafana/Loki/Tempo-oriented Docker setup. Follow its README and architecture guide when validating full cross-service propagation.

These examples are integration demonstrations, not additional public APIs. Use the crate-specific docs.rs pages for type and method details.