This background task checks the status of a given URL. If the request takes longer than a specific timeout, is cancelled (and it's considered as a 499 status code).
For every request, we store some Prometheus metrics that will be helpful to
create a dashboard to visualize the status and the evolution of the system.
Metrics are exposed in http://localhost:port/metrics, port can be adjusted
with --port=8080
Additionally, the server exposes the /exec endpoint that allows running
any command. Once the command has been executed, creates a new annotation
in the Grafana, this way you can track the evolution since that specific
moment (in this dashboard we use a dashed blue line).
For example, we can see that the response time decreases after a restart of a specific service in our docker-compose.
Example request - POST http://localhost:port/exec
{
"command": "docker compose restart"
}| Flag | Default | Description |
|---|---|---|
| url | https://google.com/ | Url to monitor |
| token | Non valid token | Grafana API token |
| host | http://localhost:3000 | Grafana host |
| frequency | 1m | Status check frequency |
| timeout | 30s | Request timeout |
| port | 8080 | Port used by the server |