[tor-relays] export iptables metrics

[Toralf Förster]

I found the time and wrote a Bash script [1] to export iptables and
ipset metrics to Prometheus/Grafana.

It works at least with [2].

[1] https://github.com/toralf/torutils/blob/main/metrics.sh
[2] https://github.com/toralf/torutils#readme

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Toralf