[app4soft]

I'm not sure when Git support was initially added to Trac, but TracGit 1.0 released in 2012.[0]

[0] https://trac.edgewall.org/wiki/TracGit

[snorlaxle]

Yes, that's when it was included to Trac 1.0 as a built-in plugin. Before that, it was a 3rd party plugin you have to install yourself. I remember using it before 2010 and I'm pretty sure the plugin pre-dates github.