Add probe_icmp_reply_hop_limit (#694)
Add probe_icmp_reply_hop_limit (#694)

IPv6 hop limit (IPv4 TTL) tells how many remaining hops the reply
datagram has. When the target uses a well known initial hop limit,
it can be used to count the number of hops from the target to the
prober and detect routing problems.

Signed-off-by: Luiz Angelo Daros de Luca <e0ce3b3937784afcb22dfe444e84ca044934412f@gmail.com>
prometheus/blackbox_exporter