Middlewares to integrate axum + tracing + opentelemetry.
For examples, you can look at the examples folder.
```txt //... use axumtracingopentelemetry::opentelemetrytracinglayer;
async fn main() -> Result<(), axum::BoxError> { // very opinionated init of tracing, look as is source to make your own inittracingopentelemetry::tracingsubscriberext::init_subscribers()?;
let app = app();
// run it
let addr = &"0.0.0.0:3000".parse::<SocketAddr>()?;
tracing::warn!("listening on {}", addr);
axum::Server::bind(&addr)
.serve(app.into_make_service())
.with_graceful_shutdown(shutdown_signal())
.await?;
Ok(())
}
fn app() -> Router { Router::new() .route("/", get(index)) // request processed inside span // include trace context as header into the response .layer(OtelInResponseLayer::default()) //start OpenTelemetry trace on incoming request .layer(OtelAxumLayer::default()) .route("/health", get(health)) // request processed without span / trace }
async fn shutdownsignal() { //... opentelemetry::global::shutdowntracer_provider(); } ```
For more info about how to initialize, you can look at crate [init-tracing-opentelemetry] or [tracing-opentelemetry].
| axum | axum-tracing-opentelemetry | |------|----------------------------| | 0.6 | latest - 0.6 | | 0.5 | 0.1 - 0.5 |
init-tracing-opentelemetry], [tonic-tracing-opentelemetry], [tracing-opentelemetry-instrumentation-sdk], without re-export and featurestrace_id from attributes (opnetelemetry) and field in trace (log,...) on creation
because the previous workaround created invalid states in some contextopentelemetry_tracing_layer, response_with_trace_layeralways_on, but read environment variables OTEL_TRACES_SAMPLER, OTEL_TRACES_SAMPLER_ARGtracing_subscriber_extotel::setup detected configuration by otel setup toolsDetectResource builder to help detection for Resource Semantic Conventions | OpenTelemetryinit_propagator to configure the global propagator based on content of the env variable OTEL_PROPAGATORSresponse_with_trace_layer to have traceparent injected into responseOTEL_EXPORTER_OTLP_TRACES_ENDPOINT, OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_TRACES_PROTOCOL, OTEL_EXPORTER_OTLP_PROTOCOL/dev/null) to allow to have trace_id
and the opentelemetry span & metadata on log and http response (without collector)