After setting up the docker-compose, you need to attach the terminal to generate signals.
docker attach telemetrygen
telemetrygen traces --duration 5s --otlp-insecure --otlp-endpoint lgtm:4317
telemetrygen metrics --duration 5s --otlp-insecure --otlp-endpoint lgtm:4317
telemetrygen logs --duration 5s --otlp-insecure --otlp-endpoint lgtm:4317