Function opentelemetry_tracing_layer 

pub fn opentelemetry_tracing_layer() -> TraceLayer<SharedClassifier<ServerErrorsAsFailures>, OtelMakeSpan, OtelOnRequest, OtelOnResponse, OtelOnBodyChunk, OtelOnEos, OtelOnFailure>

OpenTelemetry tracing middleware.

This returns a TraceLayer configured to use OpenTelemetry’s conventional span field names.

Span fields

The following fields will be set on the span:

• http.client_ip: The client’s IP address. Requires using Router::into_make_service_with_connect_info
• http.flavor: The protocol version used (http 1.1, http 2.0, etc)
• http.host: The value of the Host header
• http.method: The request method
• http.route: The matched route
• http.scheme: The URI scheme used (HTTP or HTTPS)
• http.status_code: The response status code
• http.target: The full request target including path and query parameters
• http.user_agent: The value of the User-Agent header
• otel.kind: Always server
• otel.status_code: OK if the response is success, ERROR if it is a 5xx
• trace_id: The trace id as tracted via the remote span context.

Example

use axum::{Router, routing::get, http::Request};
use axum_tracing_opentelemetry::opentelemetry_tracing_layer;
use std::net::SocketAddr;
use tower::ServiceBuilder;

let app = Router::new()
    .route("/", get(|| async {}))
    .layer(opentelemetry_tracing_layer());

axum::Server::bind(&"0.0.0.0:3000".parse().unwrap())
    // we must use `into_make_service_with_connect_info` for `opentelemetry_tracing_layer` to
    // access the client ip
    .serve(app.into_make_service_with_connect_info::<SocketAddr>())
    .await
    .expect("server failed");

Complete example

See the “opentelemetry-jaeger” example for a complete setup that includes an OpenTelemetry pipeline sending traces to jaeger.