OpenTelemetry Google Cloud Propagator

This library provides support for propagating trace context in the Google Cloud X-Cloud-Trace-Context format.

To get started with instrumentation in Google Cloud, see Generate traces and metrics with Python.

To learn more about instrumentation and observability, including opinionated recommendations for Google Cloud Observability, visit Instrumentation and observability.

Installation

pip install opentelemetry-propagator-gcp

Usage

The CloudTraceOneWayPropagator reads the Google Cloud X-Cloud-Trace-Context format, but does not write the X-Cloud-Trace-Context header on outgoing requests. It is intended for use with a CompositePropagator as below.

from opentelemetry.propagate import set_global_textmap
from opentelemetry.propagators.composite import CompositePropagator
from opentelemetry.propagators.cloud_trace_propagator import (
    CloudTraceOneWayPropagator,
)
set_global_textmap(
    CompositePropagator([
        CloudTraceOneWayPropagator(),
        propagate.get_global_textmap(),
    ]),
)

The CloudTraceFormatPropagator reads and writes the X-Cloud-Trace-Context header formats. Note that when using this propagator, the sampled bit is interpreted as the TRACE_TRUE flag, which may cause a higher sampling rate than desired. See the Trace documentation <https://cloud.google.com/trace/docs/setup#force-trace> for additional context.

from opentelemetry.propagate import set_global_textmap
from opentelemetry.propagators.cloud_trace_propagator import (
    CloudTraceFormatPropagator,
)

# Set the X-Cloud-Trace-Context header
set_global_textmap(CloudTraceFormatPropagator())

from opentelemetry.propagate import set_global_textmap
from opentelemetry.propagators.cloud_trace_propagator import (
    CloudTraceFormatPropagator,
)

# Set the X-Cloud-Trace-Context header
set_global_textmap(CloudTraceFormatPropagator())

References

• Cloud Trace
• OpenTelemetry Project