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Re:Deciding to rewrite getaddrinfo in rust by Dobbs on Tuesday February 23, 2016 @12:19PM (#11160462)
Skylight[1] from what I understand is a ruby gem written in Rust. It monitors your ruby runtime and sends the data to the central servers for analysis.

1: https://www.skylight.io/

Re:Deciding to rewrite getaddrinfo in rust by steveklabnik on Tuesday February 23, 2016 @01:58PM (#11161331)
It was also one of the first production uses of Rust.