I may have my timelines wrong but I don't remember github being rock solid 5 years ago. I remember multiple outages keeping us from pulling code for go packages that were not using an enterprise dependency cache and killing multiple days of work a year for those systems. It's what I used as a forcing function to move people TO an enterprise dependency cache, and to find the few scofflaws running work code off of github.com versus enterprise.

You're right. I was misremembering this graph:

https://damrnelson.github.io/github-historical-uptime/