Add standalone Grafana OTEL stack

[ThijsFeryn]

A standalone OTEL stack that can be visualized with Grafana.

Components

It has the following components:

• Prometheus container
• Loki container
• Tempo container
• OTEL collector container (that connects to Prometheus, Loki & Tempo)
• Grafana container

In the conf/grafana/dashboards folder, there is a basic Varnish dashboard. You can add JSON files to that folder and Grafana will pick them up without restarting the container.

Docker setup/teardown

docker compose up
docker compose down

Usage

Set the following environment variables to send telemetry data to this OTEL stack

export OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf

If you're using OTEL in a container that is not part of this stack, simply use the http://host.docker.internal:4318 endpoint.

[gquintard]

wouldn't it make more sense to change the existing otel example, open the ports locally, and to only conditionally run Varnish and the client script using https://docs.docker.com/compose/how-tos/profiles/ ?

[ThijsFeryn]

wouldn't it make more sense to change the existing otel example, open the ports locally, and to only conditionally run Varnish and the client script using https://docs.docker.com/compose/how-tos/profiles/ ?

@gquintard Fair point. See #38