Better IX network quality monitoring

[todsacerdoti]

https://blog.benjojo.co.uk/post/ixp-xping-better-ix-monitoring

[remram]

Funny, I developed a similar ping system for Prometheus, to monitor a Kubernetes edge cluster: https://github.com/remram44/prometheus-ping

I did rewrite it in Rust (from original Python) over latency concerns from the language, but it did not make much difference in the end.