How to: Interesting urls
http://localhost:9090/targets shows status of monitored targets as seen from prometheus - in this case which hosts being pinged and speedtest. note: speedtest will take a while before it shows as UP as it takes about 30s to respond.

http://localhost:9090/graph?g0.expr=probe_http_status_code&g0.tab=1 shows prometheus value for `probe_http_status_code` for each host. You can edit/play with additional values. Useful to check everything is okey in prometheus (in case Grafana is not showing the data you expect).

http://localhost:9115 blackbox exporter endpoint. Lets you see what have failed/succeded.

http://localhost:9798/metrics speedtest exporter endpoint. Does take about 30 seconds to show its result as it runs an actual speedtest when requested.