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If you are new to OpenTelemetry, start by reading Custom Instrumentation with the OpenTelemetry API to understand how OpenTelemetry integrates with Datadog.

Overview

There are a few reasons to manually instrument your applications with the OpenTelemetry API:

  • You are not using Datadog supported library instrumentation.
  • You want to extend the ddtrace library’s functionality.
  • You need finer control over instrumenting your applications.

The ddtrace library provides several techniques to help you achieve these goals. The following sections demonstrate how to use the OpenTelemetry API for custom instrumentation to use with Datadog.

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.

Here’s an example of how to add attributes to the current span:

from opentelemetry import trace

current_span = trace.get_current_span()

current_span.set_attribute("attribute_key1", 1)

Further reading