To show how you can see metrics for External calls and DB calls in FastAPI app, we have created a sample app which uses a database (MongoDB) so that the example is more realistic

• Git clone this repo

git clone https://github.com/SigNoz/sample-fastapi-with-dbs.git

Change OTEL_EXPORTER_OTLP_ENDPOINT env variable in docker-compose.yaml file to send data to SigNoz.

- OTEL_EXPORTER_OTLP_ENDPOINT=<IP of SigNoz>:4317

and then run:

docker-compose up -d

Application would be available at http://localhost:5000/. Browse and generate some data.

Or just run the following command from the terminal of your VM a few times to make some API calls to the sample app. This should return Hello World

 curl http://localhost:5000  

If you already have Mongo daemon running, you can skip the following step to install Mongo

Download MongoDB for:

• Mac from https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/
• Linux from https://docs.mongodb.com/manual/administration/install-on-linux/
• Ubuntu from https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/

You need to install redis server. For example if you are on Ubuntu, you can use the following

sudo apt-get install redis-server

pip3 install -r requirements.txt

opentelemetry-bootstrap --action=install

OTEL_METRICS_EXPORTER=none OTEL_RESOURCE_ATTRIBUTES=service.name=fastAPI OTEL_EXPORTER_OTLP_ENDPOINT="http://<IP of SigNoz>:4317" opentelemetry-instrument uvicorn app.main:app --port 5000 --host 0.0.0.0

pip3 install locust

locust -f locust.py --headless --users 10 --spawn-rate 1 -H http://localhost:5000