autoconf-auth-extension

OTLP Trace and Metrics with Google Auth Extension Example

This sample demonstrates how to use the OpenTelemetry GCP Auth Extension to configure the OpenTelemetry SDK in a manually instrumented application and export telemetry to Google Cloud using OTLP exporters for both traces and metrics.

Prerequisites

First, ensure you have Google Cloud credentials available on your machine:

gcloud auth application-default login

Executing this command will save your application credentials to the default path:

• Linux, macOS: $HOME/.config/gcloud/application_default_credentials.json
• Windows: %APPDATA%\gcloud\application_default_credentials.json

Next, set the GOOGLE_CLOUD_PROJECT environment variable to your GCP project ID:

export GOOGLE_CLOUD_PROJECT="your-gcp-project-id"

This environment variable is used by the GCP Auth Extension to identify the project.

Running the Sample

To run the sample from the repository root, use the following Gradle command:

./gradlew :examples-autoconf-auth-extension:run

Running this sample will generate traces and metrics and export them to Google Cloud via OTLP.

Configuration Details

The sample uses OpenTelemetry SDK Autoconfigure. The following system properties are configured in build.gradle and can be overridden or set as environment variables:

• otel.exporter.otlp.endpoint: Set to https://telemetry.googleapis.com for Google Cloud OTLP receiver.
• otel.traces.exporter: Set to otlp to use OTLP exporter for traces.
• otel.metrics.exporter: Set to otlp to use OTLP exporter for metrics.
• otel.exporter.otlp.protocol: Set to http/protobuf as required by Google Cloud OTLP receiver.