hello-world-flask

hello-world-flask

This simple Flask app that returns "Hello World". This app configures OpenTelemetry to send data to Honeycomb using the opentelemetry_instrument command and environment variables.

It also contains examples of:

• sending metrics with OpenTelemetry using a counter
• using baggage with context tokens
• manually passing baggage with context
• setting a span attribute

If you are looking for an example using the configure_opentelemetry() function and parameters, check out hello-world app.

Prerequisites

You'll also need Poetry installed to run the example. Poetry automatically creates a virtual environment to run the example in so you don't need to manage one yourself.

Running the example

Install the dependencies:

poetry install

Run the application:

poetry run flask run

Now you can curl the app:

$ curl localhost:5000
Hello World

Distro Instrumentation Example

To send traces to local console:

DEBUG=TRUE poetry run opentelemetry-instrument flask run

To send traces to Honeycomb:

HONEYCOMB_API_KEY="your-api-key" OTEL_SERVICE_NAME="your-service-name" poetry run opentelemetry-instrument flask run

To enable metrics, you will need to set a metrics dataset: HONEYCOMB_METRICS_DATASET=otel-python-example-metrics

You can configure exporter protocol with this flag: OTEL_EXPORTER_OTLP_PROTOCOL=grpc or OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf