Crate axum_observability 

Request correlation and structured terminal access logging for Axum.

ObservabilityLayer validates or generates request IDs, accepts strict W3C trace context, installs a RequestContext extension, and emits one terminal access event after the response body completes or is abandoned. JsonLayer formats those records and application tracing events without installing a global subscriber.

use axum::{Router, routing::get};
use axum_observability::{ObservabilityConfig, ObservabilityLayer};
use tracing_subscriber::prelude::*;

let config = ObservabilityConfig::default();
let subscriber = tracing_subscriber::registry()
    .with(config.json_layer(std::io::sink));
let app: Router = Router::new()
    .route("/health", get(|| async { "ok" }))
    .layer(ObservabilityLayer::new(config));

Structs

JsonLayer

A composable newline-delimited JSON tracing layer.

MissingRequestContext

Rejection returned when RequestContext is extracted without the observability middleware installed.

ObservabilityConfig

Configuration for ObservabilityLayer.

ObservabilityLayer

Cloneable Tower layer that installs correlation and terminal access logs.

ObservabilityService

Service produced by ObservabilityLayer.

OperationId

Stable application operation name attached to request or response extensions.

RequestContext

Correlation metadata installed in every observed request’s extensions.

RequestId

A request identifier selected by the configured request-ID policy.

TraceContext

Validated inbound W3C trace context.

Enums

FieldConvention

Structured logging field convention.

InvalidRequestId

Reason a request identifier failed baseline validation.

TraceContextLevel

W3C Trace Context level used for inbound validation and projection.