Improve Doc to Make the Tracing Context Example #575

metrics-tracing-context/Cargo.toml

@@ -42,4 +42,6 @@ criterion = { workspace = true }
 itertools = { workspace = true, features = ["use_std"] }
 parking_lot = { workspace = true }
 tracing = { workspace = true, features = ["std"] }
-tracing-subscriber = { workspace = true, features = ["registry"] }
+tracing-subscriber = { workspace = true, features = ["registry", "fmt"] }
+tokio = { workspace = true }
+metrics-exporter-prometheus = { version = "0.17.0", features = ["http-listener", "hyper", "hyper-util"] }

metrics-tracing-context/src/lib.rs

@@ -9,20 +9,25 @@
 //! First, set up `tracing` and `metrics` crates:
 //!
 //! ```rust
-//! # use metrics_util::debugging::DebuggingRecorder;
-//! # use tracing_subscriber::Registry;
+//! use metrics_exporter_prometheus::PrometheusBuilder;
 //! use metrics_tracing_context::{MetricsLayer, TracingContextLayer};
 //! use metrics_util::layers::Layer;
 //! use tracing_subscriber::layer::SubscriberExt;
+//! use tracing_subscriber::{self, Registry};
 //!
 //! // Prepare tracing.
-//! # let my_subscriber = Registry::default();
-//! let subscriber = my_subscriber.with(MetricsLayer::new());
+//! let (recorder, metric_server) = PrometheusBuilder::new()
+//!     .with_http_listener(([0, 0, 0, 0], 1111))
+//!     .build()
+//!     .unwrap();
+//! let server_handle = tokio::spawn(metric_server);
+//! let subscriber = Registry::default()
+//!     .with(tracing_subscriber::fmt::layer())
+//!     .with(MetricsLayer::new());
 //! tracing::subscriber::set_global_default(subscriber).unwrap();
 //!
-//! // Prepare metrics.
-//! # let my_recorder = DebuggingRecorder::new();
-//! let recorder = TracingContextLayer::all().layer(my_recorder);
+//! // Prepare recorder.
+//! let recorder = TracingContextLayer::all().layer(recorder);
 //! metrics::set_global_recorder(recorder).unwrap();
 //! ```
 //!