udp2p_protocol is used at run time in 4 crates.

Depender (with downloads and own rev deps) udp2p_protocol version
1 udp2p_discovery ^0.2.0
2 udp2p_gd_udp ^0.2.0
udp2p_gossip ^0.2.0
2 udp2p_transport ^0.2.0