florinpatrascu / elixir_grafana_loki_tempo

A very simple Elixir demo/project used for experimenting with Grafana Tempo and Loki #opentelemetry #observability #tracing

Elixir, Grafana, Prometheus, Loki, Tempo, OpenTelemetry and friends

Following along with the experience described in this article: How to successfully correlate metrics, logs, and traces in Grafana, using: Elixir, Grafana Tempo and Loki, with the majestic support of Elixir's own ecosystem; a very simple demo/experimental project 🎣

Setup

To handle shipping logs from docker, we need to install a docker plugin:

docker plugin install grafana/loki-docker-driver:latest --alias loki --grant-all-permissions

If you would like to disable this plugin after completing the tutorial, simply run:

docker plugin disable loki

Once that's done, we can simple bring up the services:

docker-compose up -d

Note: the mini Elixir app included with this demo project will take care of itself; bring dependencies, compile, start, etc.

Once that's up you should be able to access the following services:

• Grafana: http://localhost:3000/, w/ a smol' demo dashboard included 😜
• more details about the services started, in the docker-compose.yaml

Play time

We can use curl for producing some logs. Example:

curl 'http://localhost:4000/api/fish'
["Hake","Jack (Amber, Crevalle)","Mahi Mahi (Dolphin-fish)","Chilean sea bass"]

or you can use some mild load, and gather even more log/trace samples:

ab -n 50 -c 4 http://localhost:4000/api/fish

Loki, Tempo; some breadcrumbs

Visit your local Grafana endpoint and select the Explore menu. With the Loki datasource selected, run the following query in the Log browser text field:{compose_service="app"}

If you expand the logs, you should be able to see a Tempo button. Click on it to view the associated trace. You'd probably see something similar to this:

That's all 🤷🏻‍♂️

HTH

TODOs

✓ make the Tempo button work in the Loki logs (done)
- make the Log button work from Tempo