OpenTelemetry API Support

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Signal

OpenTelemetry API support for metrics is not available for this language. Use DogStatsD to send custom metrics instead.

OpenTelemetry API support for logs is not available for this language. Use Datadog Log Collection instead.

OpenTelemetry API support for logs is not available for Ruby. Use Datadog Log Collection instead.

Overview

Use OpenTelemetry tracing APIs with Datadog SDKs to create custom spans, add tags, record events, and more.

Setup

OpenTelemetry is supported in Java after version 1.24.0.

To configure OpenTelemetry to use the Datadog trace provider:

  1. If you have not yet read the instructions for auto-instrumentation and setup, start with the Java Setup Instructions.

  2. Make sure you only depend on the OpenTelemetry API (and not the OpenTelemetry SDK).

  3. Set the dd.trace.otel.enabled system property or the DD_TRACE_OTEL_ENABLED environment variable to true.

Adding span tags

Add custom span tags

Add custom tags to your spans corresponding to any dynamic value within your application code such as customer.id.

import io.opentelemetry.api.trace.Span;

public void doSomething() {
  Span span = Span.current();
  span.setAttribute("user-name", "Some User");
}

Adding tags globally to all spans

The dd.tags property allows you to set tags across all generated spans for an application. This is useful for grouping stats for your applications, data centers, or any other tags you would like to see in Datadog.

java -javaagent:<DD-JAVA-AGENT-PATH>.jar \
    -Ddd.tags=datacenter:njc,<TAG_KEY>:<TAG_VALUE> \
    -jar <YOUR_APPLICATION_PATH>.jar

Setting errors on span

To set an error on a span, use the setStatus method:

import static io.opentelemetry.api.trace.StatusCode.ERROR;
import io.opentelemetry.api.trace.Span;

public void doSomething() {
  Span span = Span.current();
  span.setStatus(ERROR, "Some error details...");
}

Setting tags and errors on a root span from a child span

When you want to set tags or errors on the root span from within a child span, you can use the OpenTelemetry Context API:

import io.opentelemetry.api.trace.Span;
import io.opentelemetry.api.trace.Tracer;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.ContextKey;
import io.opentelemetry.context.Scope;

public class Example {

  private final static ContextKey<Span> CONTEXT_KEY =
    ContextKey.named("opentelemetry-traces-local-root-span");

  public void begin() {
    Tracer tracer = GlobalOpenTelemetry.getTracer("my-scope", "0.1.0");
    Span parentSpan = tracer.spanBuilder("begin").startSpan();
    try (Scope scope = parentSpan.makeCurrent()) {
      createChildSpan();
    } finally {
      parentSpan.end();
    }
  }

  private void createChildSpan() {
    Tracer tracer = GlobalOpenTelemetry.getTracer("my-scope", "0.1.0");
    Span childSpan = tracer.spanBuilder("child-span").startSpan();
    try {
      Span rootSpan = Context.current().get(CONTEXT_KEY);
        if (null != rootSpan) {
          rootSpan.setAttribute("my-attribute", "my-attribute-value");
          rootSpan.setStatus(StatusCode.ERROR, "Some error details...");
        }
    } finally {
      childSpan.end();
    }
  }

}

Adding spans

If you aren't using a supported framework instrumentation, or you would like additional depth in your application's traces, you may want to add custom instrumentation to your code for complete flame graphs or to measure execution times for pieces of code.

If modifying application code is not possible, use the environment variable dd.trace.methods to detail these methods.

If you have existing @Trace or similar annotations, or prefer to use annotations to complete any incomplete traces within Datadog, use Trace Annotations.

Trace annotations

Add @WithSpan to methods to have them be traced when running OpenTelemetry and the dd-java-agent.jar. If the Agent is not attached, this annotation has no effect on your application.

OpenTelemetry's @WithSpan annotation is provided by the opentelemetry-instrumentation-annotations dependency.

import io.opentelemetry.instrumentation.annotations.WithSpan;

public class SessionManager {

  @WithSpan
  public static void saveSession() {
    // your method implementation here
  }
}

Manually creating a new span

To manually create new spans within the current trace context:

import io.opentelemetry.api.trace.Span;
import io.opentelemetry.api.trace.Tracer;
import io.opentelemetry.context.Scope;

public class Example {

  public void doSomething() {
    Tracer tracer = GlobalOpenTelemetry.getTracer("my-scope", "0.1.0");
    Span span = tracer.spanBuilder("my-resource").startSpan();
    try (Scope scope = span.makeCurrent()) {
      // do some work
    } catch (Throwable t) {
      span.recordException(t);
      throw t;
    } finally {
      span.end();
    }
  }
}

Adding span events

Adding span events requires SDK version 1.40.0 or higher.

You can add span events using the addEvent API. This method requires a name parameter and optionally accepts attributes and timestamp parameters. The method creates a new span event with the specified properties and associates it with the corresponding span.

  • Name [required]: A string representing the event's name.
  • Attributes [optional]: Key-value pairs where the key is a non-empty string and the value is a primitive type or a homogeneous array of primitive values.
  • Timestamp [optional]: A UNIX timestamp representing the event's occurrence time. Expects an Instant object.
Attributes eventAttributes = Attributes.builder()
    .put(AttributeKey.longKey("int_val"), 1L)
    .put(AttributeKey.stringKey("string_val"), "two")
    .put(AttributeKey.longArrayKey("int_array"), Arrays.asList(3L, 4L))
    .put(AttributeKey.stringArrayKey("string_array"), Arrays.asList("5", "6"))
    .put(AttributeKey.booleanArrayKey("bool_array"), Arrays.asList(true, false))
    .build();

span.addEvent("Event With No Attributes");
span.addEvent("Event With Some Attributes", eventAttributes);

Read the OpenTelemetry specification for adding events for more information.

Recording exceptions

To record exceptions, use the recordException API:

span.recordException(new Exception("Error Message"));
span.recordException(new Exception("Error Message"),
    Attributes.builder().put(AttributeKey.stringKey("status"), "failed").build());

Read the OpenTelemetry specification for recording exceptions for more information.

Trace client and Agent configuration

Both the tracing client and Datadog Agent offer additional configuration options for context propagation. You can also exclude specific resources from sending traces to Datadog if you don't want those traces to be included in calculated metrics, such as traces related to health checks.

Propagating context with headers extraction and injection

You can configure the propagation of context for distributed traces by injecting and extracting headers. Read Trace Context Propagation for information.

Resource filtering

Traces can be excluded based on their resource name, to remove synthetic traffic such as health checks from reporting traces to Datadog. This and other security and fine-tuning configurations can be found on the Security page or in Ignoring Unwanted Resources.

Setup

To configure OpenTelemetry to use the Datadog trace provider:

  1. If you have not yet read the instructions for auto-instrumentation and setup, start with the Python Setup Instructions.

  2. Set DD_TRACE_OTEL_ENABLED environment variable to true.

Creating custom spans

To create custom spans within an existing trace context:

from opentelemetry import trace

tracer = trace.get_tracer(__name__)

def do_work():
    with tracer.start_as_current_span("operation_name") as span:
        # Perform the work that you want to track with the span
        print("Doing work...")
        # When the 'with' block ends, the span is automatically closed

Accessing active spans

To access the currently active span, use the get_current_span() function:

from opentelemetry import trace

current_span = trace.get_current_span()
# enrich 'current_span' with information

Adding span tags

Add attributes to a span to provide additional context or metadata:

from opentelemetry import trace

current_span = trace.get_current_span()

current_span.set_attribute("attribute_key1", 1)

Adding span events

Adding span events requires SDK version 2.9.0 or higher.

You can add span events using the add_event API. This method requires a name parameter and optionally accepts attributes and timestamp parameters.

span.add_event("Event With No Attributes")
span.add_event("Event With Some Attributes", {"int_val": 1, "string_val": "two", "int_array": [3, 4], "string_array": ["5", "6"], "bool_array": [True, False]})

Read the OpenTelemetry specification for adding events for more information.

Recording exceptions

To record exceptions, use the record_exception API:

span.record_exception(Exception("Error Message"))
span.record_exception(Exception("Error Message"), {"status": "failed"})

Read the OpenTelemetry specification for recording exceptions for more information.

Setup

To instrument your application, initialize the Datadog tracer (dd-trace) and explicitly register its TracerProvider with the OpenTelemetry API. This ensures all OpenTelemetry calls are routed through Datadog.

  1. Add the dependencies:

    npm install dd-trace @opentelemetry/api

  2. Initialize and register the tracer in your application's entry file (for example, index.js), before any other imports:

Complete example

// 1. Import the dd-trace library (do not initialize it yet)
const ddtrace = require('dd-trace');

// 2. Initialize the Datadog tracer. This must be the first operation.
const tracer = ddtrace.init({
  // service: 'my-nodejs-app'
  // ... other Datadog configurations
});

// 3. Create and register Datadog's TracerProvider.
const provider = new tracer.TracerProvider();
provider.register(); // This wires the @opentelemetry/api to Datadog

// 4. Import and use the OpenTelemetry API
const otel = require('@opentelemetry/api');
const otelTracer = otel.trace.getTracer(
  'my-custom-instrumentation' // A name for your specific instrumentation
);

// You can now use 'otelTracer' to create spans throughout your application.

Datadog combines these OpenTelemetry spans with other Datadog APM spans into a single trace of your application. It also supports integration instrumentation and OpenTelemetry automatic instrumentation.

Adding span tags

Add custom attributes to your spans to provide additional context:

function processData(i, param1, param2) {
  return otelTracer.startActiveSpan(`processData:${i}`, (span) => {
    const result = someOperation(param1, param2);

    // Add an attribute to the span
    span.setAttribute('app.processedData', result.toString());
    span.end();
    return result;
    });
}

Creating spans

To create a new span and properly close it, use the startActiveSpan method:

function performTask(iterations, param1, param2) {
  // Create a span. A span must be closed.
  return otelTracer.startActiveSpan('performTask', (span) => {
    const results = [];
    for (let i = 0; i < iterations; i++) {
      results.push(processData(i, param1, param2));
    }
    // Be sure to end the span!
    span.end();
    return results;
  });
}

Adding span events

Adding span events requires SDK version 5.17.0/4.41.0 or higher.

You can add span events using the addEvent API:

span.addEvent('Event With No Attributes')
span.addEvent('Event With Some Attributes', {"int_val": 1, "string_val": "two", "int_array": [3, 4], "string_array": ["5", "6"], "bool_array": [true, false]})

Read the OpenTelemetry specification for adding events for more information.

Recording exceptions

To record exceptions, use the recordException API:

span.recordException(new TestError())

Read the OpenTelemetry specification for recording exceptions for more information.

Filtering requests

In some cases, you may want to exclude certain requests from being instrumented, such as health checks or synthetic traffic. You can use the blocklist or allowlist option on the http plugin to ignore these requests.

// at the top of the entry point right after tracer.init()
tracer.use('http', {
  blocklist: ['/health', '/ping']
})

You can also split the configuration between client and server if needed:

tracer.use('http', {
  server: {
    blocklist: ['/ping']
  }
})

Additionally, you can exclude traces based on their resource name to prevent the Agent from sending them to Datadog. For more information on security and fine-tuning Agent configurations, read the Security or Ignoring Unwanted Resources documentation.

Imports

Import the following packages to setup the Datadog trace provider:

import (
	"context"
	"log"
	"os"

   "github.com/DataDog/dd-trace-go/v2/ddtrace/ext"
   "github.com/DataDog/dd-trace-go/v2/ddtrace/opentelemetry"
   "github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
)

Setup

To configure OpenTelemetry to use the Datadog trace provider:

  1. Add your desired manual OpenTelemetry instrumentation to your Go code following the OpenTelemetry Go Manual Instrumentation documentation. Important! Where those instructions indicate that your code should call the OpenTelemetry SDK, call the Datadog tracing library instead.

  2. Install the OpenTelemetry package:

    go get go.opentelemetry.io/otel

  3. Install the Datadog OpenTelemetry wrapper package:

    go get github.com/DataDog/dd-trace-go/v2/ddtrace/opentelemetry

  4. Import packages:

    import (
   "go.opentelemetry.io/otel"
   ddotel "github.com/DataDog/dd-trace-go/v2/ddtrace/opentelemetry"
)

  5. Create a TracerProvider and defer the Shutdown method:

    provider := ddotel.NewTracerProvider()
defer provider.Shutdown()

  6. Set the global TracerProvider:

    otel.SetTracerProvider(provider)

  7. Run your application.

Adding span tags

Add custom tags to your spans to attach additional metadata and context:

// Start a span.
ctx, span := t.Start(ctx, "read.file")
// Set an attribute, or a tag in Datadog terminology, on a span.
span.SetAttributes(attribute.String(ext.ResourceName, "test.json"))

Adding tags globally to all spans

Add tags to all spans by configuring the tracer with the WithGlobalTag option:

provider := ddotel.NewTracerProvider(
	ddtracer.WithGlobalTag("datacenter", "us-1"),
	ddtracer.WithGlobalTag("env", "dev"),
)
defer provider.Shutdown()

otel.SetTracerProvider(provider)
t := otel.Tracer("")

Setting errors on a span

To set an error on a span:

// Start a span.
ctx, span := t.Start(context.Background(), "spanName")

// Set an error on a span with 'span.SetAttributes'.
span.SetAttributes(attribute.String(ext.ErrorMsg, "errorMsg"))

// Alternatively, set an error via end span options.
EndOptions(span, tracer.WithError(errors.New("myErr")))
span.End()

Adding spans

Unlike other Datadog tracing libraries, when tracing Go applications, Datadog recommends that you explicitly manage and pass the Go context of your spans.

ctx, span := t.Start(
	ddotel.ContextWithStartOptions(context.Background(), ddtracer.Measured()), "span_name")

span.End()

Adding span events

Adding span events requires SDK version 1.67.0 or higher.

You can add span events using the AddEvent API:

ctx, span := tracer.StartSpan(context.Background(), "span_name")
span.AddEvent("Event With No Attributes")
span.AddEvent("Event With Some Attributes", oteltrace.WithAttributes(attribute.Int("int_val", 1), attribute.String("string_val", "two")))
span.Finish()

Read the OpenTelemetry specification for adding events for more information.

Trace client and Agent configuration

Propagating context with headers extraction and injection

You can configure the propagation of context for distributed traces by injecting and extracting headers. Read Trace Context Propagation for information.

Resource filtering

Traces can be excluded based on their resource name, to remove synthetic traffic such as health checks from reporting traces to Datadog. This and other security and fine-tuning configurations can be found on the Security page.

Requirements and limitations

  • Datadog Ruby tracing library dd-trace-rb version 1.9.0 or greater.
  • Gem version support 1.1.0 or greater.

The following OpenTelemetry features implemented in the Datadog library as noted:

FeatureSupport notes
OpenTelemetry Context propagationDatadog and W3C Trace Context header formats are enabled by default.
Span processorsUnsupported
Span ExportersUnsupported
OpenTelemetry.loggerOpenTelemetry.logger is set to the same object as Datadog.logger. Configure through custom logging.
Trace/span ID generatorsID generation is performed by the tracing library, with support for 128-bit trace IDs.

Configuring OpenTelemetry to use the Datadog tracing library

  1. Add your desired manual OpenTelemetry instrumentation to your Ruby code following the OpenTelemetry Ruby Manual Instrumentation documentation. Important! Where those instructions indicate that your code should call the OpenTelemetry SDK, call the Datadog tracing library instead.

  2. Add the datadog gem to your Gemfile:

    source 'https://rubygems.org'
gem 'datadog' # For dd-trace-rb v1.x, use the `ddtrace` gem.

  3. Install the gem by running bundle install.

  4. Add the following lines to your OpenTelemetry configuration file:

    require 'opentelemetry/sdk'
require 'datadog/opentelemetry'

  5. Add a configuration block to your application:

    Datadog.configure do |c|
  ...
end

Datadog combines these OpenTelemetry spans with other Datadog APM spans into a single trace of your application. It supports integration instrumentation and OpenTelemetry Automatic instrumentation also.

Adding span events

Adding span events requires SDK version 2.3.0 or higher.

You can add span events using the add_event API:

span.add_event('Event With No Attributes')
span.add_event(
  'Event With All Attributes',
  attributes: { 'int_val' => 1, 'string_val' => 'two', 'int_array' => [3, 4], 'string_array' => ['5', '6'], 'bool_array' => [false, true]}
)

Read the OpenTelemetry specification for adding events for more information.

Recording exceptions

To record exceptions, use the record_exception API:

span.record_exception(
  StandardError.new('Error Message')
)
span.record_exception(
  StandardError.new('Error Message'),
  attributes: { 'status' => 'failed' }
)

Read the OpenTelemetry specification for recording exceptions for more information.

Setup

To configure OpenTelemetry to use the Datadog trace provider:

  1. Add your desired manual OpenTelemetry instrumentation to your .NET code following the OpenTelemetry .NET Manual Instrumentation documentation. Note: Where those instructions indicate that your code should call the OpenTelemetry SDK, call the Datadog tracing library instead.

  2. Install the Datadog .NET tracing library and enable the tracer for your .NET Framework service or your .NET Core (and .NET 5+) service. You can optionally do this with Single Step APM Instrumentation.

  3. Set DD_TRACE_OTEL_ENABLED environment variable to true.

  4. Run your application.

Datadog combines these OpenTelemetry spans with other Datadog APM spans into a single trace of your application. It also supports OpenTelemetry instrumentation libraries.

Creating custom spans

To manually create spans that start a new, independent trace:

using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

// Start a new span
using (Activity? activity = Telemetry.ActivitySource.StartActivity("<RESOURCE NAME>"))
{
  activity?.SetTag("operation.name", "custom-operation");
  // Do something
}

Creating spans

To create custom spans within an existing trace context:

using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

using (Activity? parentScope = Telemetry.ActivitySource.StartActivity("<RESOURCE NAME>"))
{
   parentScope?.SetTag("operation.name", "manual.sortorders");
   using (Activity? childScope = Telemetry.ActivitySource.StartActivity("<RESOURCE NAME>"))
   {
       childScope?.SetTag("operation.name", "manual.sortorders.child");
       SortOrders();
   }
}

Adding span tags

Add custom tags to your spans to provide additional context:

using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

public class ShoppingCartController : Controller
{
    [HttpGet]
    public IActionResult Index(int customerId)
    {
      Activity? activity = Telemetry.ActivitySource.StartActivity("<RESOURCE NAME>")

      // Add a tag to the span for use in the Datadog web UI
      activity?.SetTag("customer.id", customerId.ToString());

      var cart = _shoppingCartRepository.Get(customerId);
      return View(cart);
    }
}

Setting errors on spans

Set error information on a span when an error occurs during its execution:

try
{
    // do work that can throw an exception
}
catch(Exception e)
{
    activity?.SetTag("error", 1);
    activity?.SetTag("error.message", exception.Message);
    activity?.SetTag("error.stack", exception.ToString());
    activity?.SetTag("error.type", exception.GetType().ToString());
}

Adding span events

Adding span events requires SDK version 2.53.0 or higher.

You can add span events using the AddEvent API:

var eventTags = new ActivityTagsCollection
{
    { "int_val", 1 },
    { "string_val", "two" },
    { "int_array", new int[] { 3, 4 } },
    { "string_array", new string[] { "5", "6" } },
    { "bool_array", new bool[] { true, false } }
};

activity.AddEvent(new ActivityEvent("Event With No Attributes"));
activity.AddEvent(new ActivityEvent("Event With Some Attributes", DateTimeOffset.Now, eventTags));

Read the OpenTelemetry specification for adding events for more information.

Propagating context with headers extraction and injection

You can configure the propagation of context for distributed traces by injecting and extracting headers. Read Trace Context Propagation for information.

Setup

To configure OpenTelemetry to use the Datadog trace provider:

  1. Install OpenTelemetry API packages:

    composer require open-telemetry/sdk

  2. Add your desired manual OpenTelemetry instrumentation to your PHP code following the OpenTelemetry PHP Manual Instrumentation documentation.

  3. Install the Datadog PHP tracing library.

  4. Set DD_TRACE_OTEL_ENABLED to true.

Datadog combines these OpenTelemetry spans with other Datadog APM spans into a single trace of your application.

Adding span tags

You can add attributes at the exact moment as you are starting the span:

$span = $tracer->spanBuilder('mySpan')
    ->setAttribute('key', 'value')
    ->startSpan();

Or while the span is active:

$activeSpan = OpenTelemetry\API\Trace\Span::getCurrent();
$activeSpan->setAttribute('key', 'value');

Setting errors on a span

Exception information is captured and attached to a span if one is active when the exception is raised:

// Create a span
$span = $tracer->spanBuilder('mySpan')->startSpan();

throw new \Exception('Oops!');

// 'mySpan' will be flagged as erroneous and have
// the stack trace and exception message attached as tags

Flagging a trace as erroneous can also be done manually:

use OpenTelemetry\API\Trace\Span;
use OpenTelemetry\Context\Context;

try {
    throw new \Exception('Oops!');
} catch (\Exception $e) {
    $rootSpan = Span::fromContext(Context::getRoot());
    $rootSpan->recordException($e);
}

Adding spans

To add a span:

// Get a tracer or use an existing one
$tracerProvider = \OpenTelemetry\API\Globals::tracerProvider();
$tracer = $tracerProvider->getTracer('datadog')

// Create a span
$span = $tracer->spanBuilder('mySpan')->startSpan();

// ... do stuff

// Close the span
$span->end();

Adding span events

Adding span events requires SDK version 1.3.0 or higher.

You can add span events using the addEvent API:

$span->addEvent("Event With No Attributes");
$span->addEvent(
    "Event With Some Attributes",
    [
        'int_val' => 1,
        'string_val' => "two",
        'int_array' => [3, 4],
        'string_array' => ["5", "6"],
        'bool_array' => [true, false]
    ]
);

Read the OpenTelemetry specification for adding events for more information.

Recording exceptions

To record exceptions, use the recordException API:

$span->recordException(new \Exception("Error Message"));
$span->recordException(new \Exception("Error Message"), [ "status" => "failed" ]);

Read the OpenTelemetry specification for recording exceptions for more information.

Accessing active spans

To access the currently active span:

$span = OpenTelemetry\API\Trace\Span::getCurrent();

The Datadog Rust SDK is in Preview.

Datadog provides support for custom instrumentation in Rust applications through the datadog-opentelemetry crate. This library is built on the OpenTelemetry (OTel) API and SDK, providing a tracer that includes Datadog-specific features and an exporter.

Because this library is built on OpenTelemetry, you use the standard OpenTelemetry API to create traces and spans.

Setup

To configure your Rust application to send OpenTelemetry traces to Datadog:

1. Add dependencies

Add datadog-opentelemetry and the core opentelemetry crate to your Cargo.toml:

cargo add datadog-opentelemetry opentelemetry

2. Initialize the Tracer

In your application's main function, initialize the Datadog tracer provider:

You must shut down the provider before your application exits to ensure all pending traces are flushed.

use datadog_opentelemetry;
use opentelemetry::{global, trace::Tracer};
use std::time::Duration;

fn main() {
    // This picks up env var configuration (like DD_SERVICE)
    // and initializes the global tracer provider
    let tracer_provider = datadog_opentelemetry::tracing()
        .init();

    // --- Your application code starts here ---
    let tracer = global::tracer("my-component");

    tracer.in_span("my-operation", |_cx| {
        // ... do work ...
    });

    println!("Doing work...");

    // --- Your application code ends here ---

    // Shut down the tracer provider to flush remaining spans
    tracer_provider.shutdown_with_timeout(Duration::from_secs(5)).expect("tracer shutdown error");
}

3. Ensure Agent is running

The Datadog exporter sends traces to the Datadog Agent, which must be running and accessible.

Configuration

The Datadog Rust SDK is configured using environment variables. For a complete list of options, see the Configuration documentation.

Examples

Get a Tracer

Get an instance of a Tracer from the global provider:

use opentelemetry::global;

let tracer = global::tracer("my-component");

Create a span

Use tracer.in_span to create a new span. The span is automatically ended when the closure finishes:

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

fn do_work() {
    let tracer = global::tracer("my-component");

    tracer.in_span("operation_name", |_cx| {
        // The span is active within this closure
        println!("Doing work...");
    });
}

Create a child span

To create a child span, nest in_span calls:

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

fn parent_operation() {
    let tracer = global::tracer("my-component");

    tracer.in_span("parent_operation", |_cx| {
        tracer.in_span("child_operation", |_cx| {
            // This span is automatically parented to "parent_operation"
            println!("Doing child work...");
        });
        println!("Doing parent work...");
    });
}

Add span tags

Add attributes to a span using the set_attribute method:

use opentelemetry::trace::{Tracer, TraceContextExt};
use opentelemetry::KeyValue;

fn add_tags_to_span() {
    let tracer = opentelemetry::global::tracer("my-component");

    tracer.in_span("operation.with.tags", |cx| {
        let span = cx.span();

        span.set_attribute(KeyValue::new("customer.id", "12345"));
        span.set_attribute(KeyValue::new("http.method", "GET"));
    });
}

Add span events

Add time-stamped log messages to a span using the add_event method:

use opentelemetry::trace::{Tracer, TraceContextExt};
use opentelemetry::KeyValue;

fn add_events_to_span() {
    let tracer = opentelemetry::global::tracer("my-component");

    tracer.in_span("operation.with.events", |cx| {
        let span = cx.span();

        span.add_event("Data received", vec![]);
        span.add_event(
            "Processing data",
            vec![
                KeyValue::new("data.size_bytes", 1024),
                KeyValue::new("data.format", "json"),
            ],
        );
    });
}

Context propagation

Because Rust does not have automatic instrumentation, you must manually propagate the trace context when making or receiving remote calls to connect traces across services.

For more information, see Trace Context Propagation.

Overview

Use the OpenTelemetry Metrics API with Datadog SDKs to send custom application metrics. This is an alternative to DogStatsD.

The Datadog SDK provides a native implementation of the OpenTelemetry API. This means you can write code against the standard OTel interfaces without needing the official OpenTelemetry SDK.

You should not install the official OpenTelemetry SDK or any OTLP Exporter packages. The Datadog SDK provides this functionality. Installing both can lead to runtime conflicts and duplicate data.

This approach works with the existing OpenTelemetry SDK. When you enable this feature, the Datadog SDK detects the OTel SDK and configures its OTLP exporter to send metrics to the Datadog Agent.

Prerequisites

  • .NET Runtime: Requires .NET 6+ (or System.Diagnostics.DiagnosticSource v6.0.0+). See Version and instrument support for a list of supported instruments by version.
  • Datadog SDK: dd-trace-dotnet version 3.30.0 or later.
  • Datadog SDK: dd-trace-js version 5.81.0 or later.
  • OpenTelemetry API: @opentelemetry/api version 1.0.0 to 1.10.0. (The Datadog SDK provides the implementation for this API).
  • Datadog SDK: dd-trace-py version 3.18.0 or later.

The OpenTelemetry Metrics SDK for Ruby is currently in alpha implementation. Report issues with the SDK at opentelemetry-ruby/issues.

  • Datadog SDK: datadog gem version 2.23.0 or later.
  • An OTLP-compatible destination: You must have a destination (Agent or Collector) listening on ports 4317 (gRPC) or 4318 (HTTP) to receive OTel metrics.
  • DogStatsD (Runtime Metrics): If you also use Datadog Runtime Metrics, ensure the Datadog Agent is listening for DogStatsD traffic on port 8125 (UDP). OTel configuration does not route Runtime Metrics through OTLP.

Setup

Follow these steps to enable OTel Metrics API support in your application.

  1. Install the Datadog SDK. Follow the installation steps for your runtime:
  2. Enable OTel metrics by setting the following environment variable:
    export DD_METRICS_OTEL_ENABLED=true
  1. Install the Datadog SDK:
    npm install dd-trace
  2. Enable OTel metrics by setting the following environment variable:
    export DD_METRICS_OTEL_ENABLED=true
  3. Instrument your application:
    // On application start
require('dd-trace').init();
  1. Install the Datadog SDK:
    pip install ddtrace
  2. Install the OTel SDK and Exporter:
    pip install opentelemetry-sdk opentelemetry-exporter-otlp
  3. Enable OTel metrics by setting the following environment variable:
    export DD_METRICS_OTEL_ENABLED=true
  4. Instrument your application:
    ddtrace-run python my_app.py
  1. Add the Datadog SDK and OTel gems:
    # Add to your Gemfile
gem 'datadog', '~> 2.23.0'
gem 'opentelemetry-metrics-sdk', '~> 0.8'
gem 'opentelemetry-exporter-otlp-metrics', '~> 0.4'
  2. Install dependencies:
    bundle install
  3. Enable OTel metrics by setting the following environment variable:
    export DD_METRICS_OTEL_ENABLED=true
  4. Configure your application:
    require 'opentelemetry/sdk'
require 'datadog/opentelemetry'

Datadog.configure do |c|
  # Configure Datadog settings here
end

# Call after Datadog.configure to initialize metrics
OpenTelemetry::SDK.configure

Examples

You can use the standard OpenTelemetry API packages to create custom metrics.

Create a counter

This example uses the OTel Metrics API to create a counter that increments every time an item is processed:

using System.Diagnostics.Metrics;

// Define a meter
Meter meter = new("MyService", "1.0.0");

// Create a counter instrument
Counter<long> requestsCounter = meter.CreateCounter<long>("http.requests_total");

// Perform work
// ...

// Record measurements
requestsCounter.Add(1, new("method", "GET"), new("status_code", "200"));

const { metrics } = require('@opentelemetry/api');

const meter = metrics.getMeter('my-service', '1.0.0');

// Counter - monotonically increasing values
const requestCounter = meter.createCounter('http.requests', {
  description: 'Total HTTP requests',
  unit: 'requests'
});
requestCounter.add(1, { method: 'GET', status: 200 });

import os
os.environ["DD_METRICS_OTEL_ENABLED"] = "true"
import ddtrace.auto # This must be imported before opentelemetry
from opentelemetry import metrics

# ddtrace automatically configures the MeterProvider
meter = metrics.get_meter(__name__)

# Counter - monotonically increasing values
counter = meter.create_counter("http.requests_total")
counter.add(1, {"method": "GET", "status_code": "200"})

require 'opentelemetry/api'

# dd-trace-rb automatically configures the MeterProvider
meter = OpenTelemetry.meter_provider.meter('my-service', '1.0.0')

# Counter - monotonically increasing values
counter = meter.create_counter('http.requests_total')
counter.add(1, attributes: { 'method' => 'GET', 'status_code' => '200' })

Create a histogram

This example uses the OTel Metrics API to create a histogram to track request durations:

using System.Diagnostics.Metrics;

// Define a meter
Meter meter = new("MyService", "1.0.0");

// Create a histogram instrument
Histogram<double> responseTimeHistogram = meter.CreateHistogram<double>("http.response.time");

// Perform work
var watch = System.Diagnostics.Stopwatch.StartNew();
await Task.Delay(1_000);
watch.Stop();

// Record measurements
responseTimeHistogram.Record(watch.ElapsedMilliseconds, new("method", "GET"), new("status_code", "200"));

const { metrics } = require('@opentelemetry/api');

const meter = metrics.getMeter('my-service', '1.0.0');

// Histogram - distribution of values
const durationHistogram = meter.createHistogram('http.duration', {
  description: 'HTTP request duration',
  unit: 'ms'
});
durationHistogram.record(145, { route: '/api/users' });

import os
os.environ["DD_METRICS_OTEL_ENABLED"] = "true"
import ddtrace.auto # This must be imported before opentelemetry
from opentelemetry import metrics
import time

# ddtrace automatically configures the MeterProvider
meter = metrics.get_meter(__name__)

# Histogram - distribution of values
histogram = meter.create_histogram(
    name="http.request_duration",
    description="HTTP request duration",
    unit="ms"
)

start_time = time.time()
# ... simulate work ...
time.sleep(0.05)
end_time = time.time()

duration = (end_time - start_time) * 1000 # convert to milliseconds
histogram.record(duration, {"method": "POST", "route": "/api/users"})

require 'opentelemetry/api'
require 'time'

# dd-trace-rb automatically configures the MeterProvider
meter = OpenTelemetry.meter_provider.meter('my-service', '1.0.0')

# Histogram - distribution of values
histogram = meter.create_histogram('http.request_duration',
  description: 'HTTP request duration',
  unit: 'ms'
)

start_time = Time.now
# ... simulate work ...
sleep(0.05)
end_time = Time.now

duration = (end_time - start_time) * 1000 # convert to milliseconds
histogram.record(duration, attributes: { 'method' => 'POST', 'route' => '/api/users' })

Supported configuration

To enable this feature, you must set DD_METRICS_OTEL_ENABLED=true.

All OTLP exporter settings (such as endpoints, protocols, and timeouts), resource attributes, and temporality preferences are configured using a shared set of OpenTelemetry environment variables.

For a complete list of all shared OTLP environment variables, see OpenTelemetry Environment Variables Interoperability.

Migrate from other setups

Existing OTel setup

If you are already using the OpenTelemetry SDK with a manual OTLP exporter configuration, follow these steps to migrate:

  1. Add the Datadog SDK (dd-trace-dotnet) to your project and enable its instrumentation.
  2. Remove any code that manually configures the OtlpExporter for metrics. The Datadog SDK handles this configuration automatically.
  3. Remove the OpenTelemetry and OpenTelemetry.Exporter.OpenTelemetryProtocol packages from your project's dependencies.
  4. Set the DD_METRICS_OTEL_ENABLED=true environment variable.
  1. Add the Datadog SDK (dd-trace) to your project and enable its instrumentation.
  2. Remove any code that manually configures the OTLPMetricsExporter. The Datadog SDK handles this configuration automatically.
  3. Remove the @opentelemetry/sdk-node and @opentelemetry/exporter-otlp packages from your project's dependencies.
  4. Set the DD_METRICS_OTEL_ENABLED=true environment variable.
  1. Add the Datadog SDK (dd-trace-py) to your project and enable its instrumentation (for example, ddtrace-run).
  2. Remove any code that manually configures the OTLPMetricsExporter. The Datadog SDK handles this configuration automatically.
  3. Set the DD_METRICS_OTEL_ENABLED=true environment variable.
  1. Add the Datadog SDK (datadog) to your project and enable its instrumentation.
  2. Remove any code that manually configures the OTLPMetricsExporter. The Datadog SDK handles this configuration automatically.
  3. Set the DD_METRICS_OTEL_ENABLED=true environment variable.

Runtime and trace metrics continue to be submitted using StatsD. Only custom metrics created through the OpenTelemetry Metrics API are sent using OTLP. The dd-trace-rb implementation supports exporting OTLP metrics exclusively to a Datadog Agent or OpenTelemetry Collector. Multiple exporters are not supported.

Existing DogStatsD setup

If you are currently using the Datadog DogStatsD client and want to migrate to the OpenTelemetry Metrics API, you need to update your instrumentation code. The main difference is that OTel metrics are configured using environment variables rather than code, and you create Instrument objects first.

Troubleshooting

  • Ensure DD_METRICS_OTEL_ENABLED is set to true.
  • Verify that your OTLP destination is configured correctly to receive metrics.
  • If you are sending data to the Datadog Agent, ensure OTLP ingestion is enabled. See Enabling OTLP Ingestion on the Datadog Agent for details.
  • Verify Datadog automatic instrumentation is active. This feature relies on Datadog's automatic instrumentation to function. Ensure you have completed all setup steps to enable the .NET instrumentation hooks, as these are required to intercept the metric data.
  • If, after removing the OpenTelemetry SDK packages, your application fails to compile due to missing APIs in the System.Diagnostics.Metrics namespace, you must update your application by either adding a direct NuGet package reference to System.Diagnostics.DiagnosticSource or upgrading the version of .NET. See .NET version and instrument support for more information.
  • Verify dd-trace is initialized first. The Datadog SDK must be initialized at the top of your application, before any other modules are imported.
  • Verify @opentelemetry/api is installed. The Node.js SDK requires this API package.
  • Verify opentelemetry-sdk is installed. The Python SDK requires opentelemetry-sdk and opentelemetry-exporter-otlp to be installed in your Python environment.
  • Ensure ddtrace-run is active. Verify that you are running your application with ddtrace-run (or have imported and initialized ddtrace manually).
  • Verify required gems are installed. Ensure opentelemetry-metrics-sdk and opentelemetry-exporter-otlp-metrics are installed in your Ruby environment.
  • Ensure Datadog.configure is called before OpenTelemetry::SDK.configure. The Datadog SDK must be configured first to properly set up the meter provider.

.NET version and instrument support

Support for specific OpenTelemetry metric instruments is dependent on your .NET runtime version or the version of the System.Diagnostics.DiagnosticSource NuGet package you have installed.

Here is the minimum version required for each instrument type:

  • .NET 6+ (or System.Diagnostics.DiagnosticSource v6.0.0) supports:

    • Counter
    • Histogram
    • ObservableCounter
    • ObservableGauge

  • .NET 7+ (or System.Diagnostics.DiagnosticSource v7.0.0) supports:

    • UpDownCounter
    • ObservableUpDownCounter

  • .NET 9+ (or System.Diagnostics.DiagnosticSource v9.0.0) supports:

    • Gauge

Overview

Use the OpenTelemetry Logs API with Datadog SDKs to send custom application logs. This is an alternative to Datadog's traditional log injection.

The Datadog SDK provides a native implementation of the OpenTelemetry API. This means you can write code against the standard OTel interfaces without needing the official OpenTelemetry SDK.

You should not install the official OpenTelemetry SDK or any OTLP Exporter packages. The Datadog SDK provides this functionality. Installing both can lead to runtime conflicts and duplicate data.

This approach works with the existing OpenTelemetry SDK. When you enable this feature, the Datadog SDK detects the OTel SDK and configures its OTLP exporter to send logs to the Datadog Agent.

Prerequisites

  • Datadog SDK: dd-trace-dotnet version 3.31.0 or later.
  • Datadog SDK: dd-trace-js version 5.73.0 or later.
  • OpenTelemetry Logs API: The @opentelemetry/api-logs package is required, in a version from v0.200.0 up to v1.0.

The @opentelemetry/api-logs package is still experimental, and version 1.0 has not yet been released. New versions of this package may introduce breaking changes that affect compatibility.

If you encounter an issue after upgrading @opentelemetry/api-logs, open an issue in the dd-trace-js repository.

  • Datadog SDK: dd-trace-py version 3.18.0 or later.
  • An OTLP-compatible destination: You must have a destination (Agent or Collector) listening on ports 4317 (gRPC) or 4318 (HTTP) to receive OTel logs.

Setup

Follow these steps to enable OTel Logs API support in your application.

  1. Install the Datadog SDK. Follow the installation steps for your runtime:
  2. Enable OTel logs export by setting the following environment variable:
    export DD_LOGS_OTEL_ENABLED=true
  1. Install the Datadog SDK:
    npm install dd-trace
  2. Install the OpenTelemetry Logs API package:
    npm install @opentelemetry/api-logs
  3. Enable OTel logs export by setting the following environment variable:
    export DD_LOGS_OTEL_ENABLED=true
  4. Initialize the Datadog SDK (dd-trace) at the beginning of your application, before any other modules are imported:
    // This must be the first line of your application
require('dd-trace').init()

// Other imports can follow
const { logs } = require('@opentelemetry/api-logs')
const express = require('express')
  1. Install the Datadog SDK:
    pip install ddtrace
  2. Install the OTel SDK and Exporter:
    pip install opentelemetry-sdk opentelemetry-exporter-otlp>=1.15.0
  3. Enable OTel logs export by setting the following environment variable:
    export DD_LOGS_OTEL_ENABLED=true
  4. Run your application using ddtrace-run:
    ddtrace-run python my_app.py
    When enabled, ddtrace automatically detects the OTel packages and configures the OTLPLogExporter to send logs to your OTLP destination.

Examples

Standard logging

using Microsoft.Extensions.Logging;

// For a Console application, manually create a logger factory
using var loggerFactory = LoggerFactory.Create(builder =>
{
    builder.SetMinimumLevel(LogLevel.Debug);
});

// Get a logger instance
var logger = loggerFactory.CreateLogger<Program>();

// This log will be exported via OTLP
logger.LogInformation("This is a standard log message.");

Trace and log correlation

This example shows how logs emitted within an active Datadog span are automatically correlated. If you are using the OTel Tracing API or built-in .NET Activity API to create spans, ensure OTel Tracing API support is enabled by setting DD_TRACE_OTEL_ENABLED=true.

using Microsoft.Extensions.Logging;
using System.Diagnostics;
using System.Threading.Tasks;

// For a Console application, manually create a logger factory
using var loggerFactory = LoggerFactory.Create(builder =>
{
    builder.SetMinimumLevel(LogLevel.Debug);
});

// Get a logger instance
var logger = loggerFactory.CreateLogger<Program>();

// Create an activity source
var activitySource = new ActivitySource("MyService", "1.0.0");

// Start an activity (span)
using (var activity = activitySource.StartActivity("do.work"))
{
    // This log is automatically correlated with the 'do.work' span
    logger.LogInformation("This log is correlated to the active span.");
    await Task.Delay(TimeSpan.FromMilliseconds(100));
    logger.LogWarning("So is this one.");
}

Emitting a log

After the Datadog SDK is initialized, you can use the standard OpenTelemetry Logs API to get a logger and emit log records.

// Tracer must be initialized first
require('dd-trace').init()

const { logs } = require('@opentelemetry/api-logs')
const logger = logs.getLogger('my-service', '1.0.0')

// Emit a log record
logger.emit({
  severityText: 'INFO',
  severityNumber: 9,
  body: `User clicked the checkout button.`,
  attributes: {
    'cart.id': 'c-12345',
    'user.id': 'u-54321'
  }
})

Trace and log correlation

Trace and log correlation is automatic. When you emit a log using the OTel Logs API within an active Datadog trace, the trace_id and span_id are automatically added to the log record.

// Tracer must be initialized first
require('dd-trace').init()

const { logs } = require('@opentelemetry/api-logs')
const express = require('express')

const app = express()
const logger = logs.getLogger('my-service', '1.0.0')

app.get('/api/users/:id', (req, res) => {
  // This log is automatically correlated with the 'express.request' span
  logger.emit({
    severityText: 'INFO',
    severityNumber: 9,
    body: `Processing user request for ID: ${req.params.id}`,
  })
  res.json({ id: req.params.id, name: 'John Doe' })
})

app.listen(3000)

The Datadog SDK supports the OpenTelemetry Logs API for Python's built-in logging module. You do not need to change your existing logging code.

Standard logging

This example shows a standard log message. With DD_LOGS_OTEL_ENABLED=true, this log is automatically captured, formatted as OTLP, and exported.

import logging
import time

# Get a logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

# Add a handler to see logs in the console (optional)
handler = logging.StreamHandler()
logger.addHandler(handler)

# This log will be exported via OTLP
logger.info("This is a standard log message.")

Trace and log correlation

This example shows how logs emitted within an active Datadog span are automatically correlated.

from ddtrace import tracer
import logging
import time

# Standard logging setup
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter('%(message)s'))
logger.addHandler(handler)

@tracer.wrap("do.work")
def do_work():
    # This log is automatically correlated with the 'do.work' span
    logger.info("This log is correlated to the active span.")
    time.sleep(0.1)
    logger.warning("So is this one.")

print("Starting work...")
do_work()
print("Work complete.")

Supported configuration

To enable this feature, you must set DD_LOGS_OTEL_ENABLED=true.

All OTLP exporter settings (such as endpoints, protocols, and timeouts), resource attributes, and batch processor settings are configured using a shared set of OpenTelemetry environment variables.

For a complete list of all shared OTLP environment variables, see OpenTelemetry Environment Variables Interoperability.

Migrate from other setups

Existing OTel setup

If you are already using the OpenTelemetry SDK with a manual OTLP exporter configuration, follow these steps to migrate:

  1. Add the Datadog SDK (dd-trace-dotnet) to your project and enable its instrumentation.
  2. Remove any code that manually configures the OtlpExporter for logs. The Datadog SDK handles this configuration automatically.
  3. Remove the OpenTelemetry and OpenTelemetry.Exporter.OpenTelemetryProtocol packages from your project's dependencies.
  4. Set the DD_LOGS_OTEL_ENABLED=true environment variable.
  1. Remove the OTel SDK and OTLP Exporter packages:
    npm uninstall @opentelemetry/sdk-logs @opentelemetry/exporter-otlp-logs
  2. Remove all manual OTel SDK initialization code (for example, new LoggerProvider(), addLogRecordProcessor(), new OTLPLogExporter()).
  3. Install the Datadog SDK: npm install dd-trace
  4. Keep the @opentelemetry/api-logs package.
  5. Set DD_LOGS_OTEL_ENABLED=true and initialize dd-trace at the top of your application.

Your existing code that uses logs.getLogger() will continue to work.

  1. Remove your manual setup code (for example, LoggerProvider, BatchLogRecordProcessor, and OTLPLogExporter instantiation).
  2. Enable ddtrace-run auto-instrumentation for your application.
  3. Set the DD_LOGS_OTEL_ENABLED=true environment variable.

The Datadog SDK will programmatically configure the OTel SDK for you.

Existing Datadog log injection

If you are using Datadog's traditional log injection (where DD_LOGS_INJECTION=true adds trace context to text logs) and an Agent to tail log files:

  1. Set the DD_LOGS_OTEL_ENABLED=true environment variable.
  2. The Datadog SDK automatically disables the old log injection style (DD_LOGS_INJECTION) to prevent duplicate trace metadata in your logs. Trace correlation is handled by the structured OTLP payload.
  3. Ensure your Datadog Agent is configured to receive OTLP logs (version 7.48.0 or greater is required)
  4. Disable any file-based log collection for this service to avoid duplicate logs.

Troubleshooting

  • Ensure DD_LOGS_OTEL_ENABLED is set to true.
  • Verify that your OTLP destination is configured correctly to receive logs.
  • If you are sending data to the Datadog Agent, ensure OTLP ingestion is enabled. See Enabling OTLP Ingestion on the Datadog Agent for details.
  • Verify Datadog automatic instrumentation is active. This feature relies on Datadog's automatic instrumentation to function. Ensure you have completed all setup steps to enable the .NET instrumentation hooks, as these are required to intercept the log data.
  • Verify dd-trace is initialized first. The Datadog SDK must be initialized at the top of your application, before any other modules are imported.
  • Verify @opentelemetry/api-logs is installed. The Node.js SDK requires this API package.
  • Verify opentelemetry-sdk is installed. The Python SDK requires opentelemetry-sdk and opentelemetry-exporter-otlp to be installed in your Python environment.
  • Ensure ddtrace-run is active. Verify that you are running your application with ddtrace-run (or have imported and initialized ddtrace manually).

Further reading

Additional helpful documentation, links, and articles: