Crate opentelemetry

OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Compiler support: requires rustc 1.46+

Getting Started

use opentelemetry::{global, sdk::export::trace::stdout, trace::Tracer};

fn main() {
    // Create a new trace pipeline that prints to stdout
    let tracer = stdout::new_pipeline().install_simple();

    tracer.in_span("doing_work", |cx| {
        // Traced app logic here...
    });

    // Shutdown trace pipeline
    global::shutdown_tracer_provider();
}

See the examples directory for different integration patterns.

Traces

The trace module includes types for tracking the progression of a single request while it is handled by services that make up an application. A trace is a tree of Spans which are objects that represent the work being done by individual services or components involved in a request as it flows through a system.

Creating and exporting spans

use opentelemetry::{global, trace::{Span, Tracer}, KeyValue};

// get a tracer from a provider
let tracer = global::tracer("my_service");

// start a new span
let mut span = tracer.start("my_span");

// set some attributes
span.set_attribute(KeyValue::new("http.client_ip", "83.164.160.102"));

// perform some more work...

// end or drop the span to export
span.end();

See the trace module docs for more information on creating and managing spans.

Metrics

Note: the metrics specification is still in progress and subject to major changes.

The [metrics] module includes types for recording measurements about a service at runtime.

Creating instruments and recording measurements

use opentelemetry::{global, KeyValue};

// get a meter from a provider
let meter = global::meter("my_service");

// create an instrument
let counter = meter.u64_counter("my_counter").init();

// record a measurement
counter.add(1, &[KeyValue::new("http.client_ip", "83.164.160.102")]);

See the [metrics] module docs for more information on creating and managing instruments.

Crate Feature Flags

The following core crate feature flags are available:

• trace: Includes the trace API and SDK (enabled by default).
• metrics: Includes the unstable metrics API and SDK.
• serialize: Adds serde serializers for common types.

Support for recording and exporting telemetry asynchronously can be added via the following flags:

• rt-tokio: Spawn telemetry tasks using tokio’s multi-thread runtime.
• rt-tokio-current-thread: Spawn telemetry tasks on a separate runtime so that the main runtime won’t be blocked.
• rt-async-std: Spawn telemetry tasks using async-std’s runtime.

Related Crates

In addition to opentelemetry, the open-telemetry/opentelemetry-rust repository contains several additional crates designed to be used with the opentelemetry ecosystem. This includes a collection of trace SpanExporter and metrics pull and push controller implementations, as well as utility and adapter crates to assist in propagating state and instrumenting applications.

In particular, the following crates are likely to be of interest:

• opentelemetry-http provides an interface for injecting and extracting trace information from http headers.
• opentelemetry-jaeger provides a pipeline and exporter for sending trace information to Jaeger.
• opentelemetry-otlp exporter for sending trace and metric data in the OTLP format to the OpenTelemetry collector.
• opentelemetry-prometheus provides a pipeline and exporter for sending metrics information to Prometheus.
• opentelemetry-zipkin provides a pipeline and exporter for sending trace information to Zipkin.
• opentelemetry-datadog provides additional exporters to Datadog.
• opentelemetry-aws provides unofficial propagators for AWS X-ray.
• opentelemetry-contrib provides additional exporters and propagators that are experimental.
• opentelemetry-semantic-conventions provides standard names and semantic otel conventions.
• opentelemetry-stackdriver provides an exporter for Google’s Cloud Trace (which used to be called StackDriver).

Additionally, there are also several third-party crates which are not maintained by the opentelemetry project. These include:

• tracing-opentelemetry provides integration for applications instrumented using the tracing API and ecosystem.
• actix-web-opentelemetry provides integration for the actix-web web server and ecosystem.
• opentelemetry-application-insights provides an unofficial Azure Application Insights exporter.
• opentelemetry-tide provides integration for the Tide web server and ecosystem.

If you’re the maintainer of an opentelemetry ecosystem crate not listed above, please let us know! We’d love to add your project to the list!

Supported Rust Versions

OpenTelemetry is built against the latest stable release. The minimum supported version is 1.46. The current OpenTelemetry version is not guaranteed to build on Rust versions earlier than the minimum supported version.

The current stable Rust compiler and the three most recent minor versions before it will always be supported. For example, if the current stable compiler version is 1.49, the minimum supported version will not be increased past 1.46, three minor versions prior. Increasing the minimum supported compiler version is not considered a semver breaking change as long as doing so complies with this policy.

Modules

• baggage
  Primitives for sending name-value data across system boundaries.
• global
  Utilities for working with global telemetry primitives
• propagation
  OpenTelemetry Propagator interface
• runtime
  Provides an abstraction of several async runtimes
• sdk
  OpenTelemetry SDK
• trace
  API for tracing applications and libraries.

Structs

• Context
  An execution-scoped collection of values.
• ContextGuard
  A guard that resets the current context to the prior context when dropped.
• Key
  Key used for metric AttributeSets and trace Span attributes.
• KeyValue
  KeyValue pairs are used by AttributeSets and Span attributes.

Enums

• Array
  Array of homogeneous values
• Value
  Value types for use in KeyValue pairs.