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Move code from README into a basic example
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use opentelemetry::trace::TracerProvider as _; | ||
use opentelemetry_sdk::trace::TracerProvider; | ||
use opentelemetry_stdout as stdout; | ||
use tracing::{error, span}; | ||
use tracing_subscriber::layer::SubscriberExt; | ||
use tracing_subscriber::Registry; | ||
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fn main() { | ||
// Create a new OpenTelemetry trace pipeline that prints to stdout | ||
let provider = TracerProvider::builder() | ||
.with_simple_exporter(stdout::SpanExporter::default()) | ||
.build(); | ||
let tracer = provider.tracer("readme_example"); | ||
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// Create a tracing layer with the configured tracer | ||
let telemetry = tracing_opentelemetry::layer().with_tracer(tracer); | ||
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// Use the tracing subscriber `Registry`, or any other subscriber | ||
// that impls `LookupSpan` | ||
let subscriber = Registry::default().with(telemetry); | ||
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// Trace executed code | ||
tracing::subscriber::with_default(subscriber, || { | ||
// Spans will be sent to the configured OpenTelemetry exporter | ||
let root = span!(tracing::Level::TRACE, "app_start", work_units = 2); | ||
let _enter = root.enter(); | ||
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error!("This event will be logged in the root span."); | ||
}); | ||
} |