Prometheus WAN monitor
This is a simple Python application that takes measurements of your Internet collection and exposes them in Prometheus format.
The use is simple: install this with pip install git+https://github.com/gjulianm/prometheus-wan-exporter.git and run it with the command prometheus-wan-exporter. Then, you can add it to your Prometheus scraping configuration. By default it listens on port 26543, but it can be changed with the --port CLI argument. There are other settings you can change, run prometheus-wan-exporter --help to see the available options.
Speed test
This program uses speedtest-cli to measure bandwidth agains the best available server. By default, it will check the bandwidth every 10 minutes, as to not cause too much interference. This means that the bandwidth will appear as constant in Prometheus all that time.
The resulting metrics will be wan_bandwidth_bps, with two attributes: dir for upload/download and server for the measurement server used.
Latency test
Latency test is done by pinging some servers (for now, Google and Cloudflare DNS, but if you want you can change the IPs in the ping_hosts variable of the function latency_check() in the main.py file). All measures go into a histogram metric from Prometheus (wan_latency_hist_seconds), and the mean of each batch is set in a gauge (wan_latency_seconds). Both metrics have the attribute server with the server used for the ping.
Running as a service
You can use the prometheus-wan-monitor.service, set in ExecStart the correct path of the prometheus-wan-exporter executable (and change any CLI arguments you want) and then drop the file in /etc/systemd/system. After running systemctl daemon-reload, you will be able to use prometheus-wan-exporter as a regular systemd service and enable it on boot if you want.
Dashboard
In case it is helpful, you can download the dashboard and import it in your Grafana instance.