You're right. I was misremembering this graph:
https://damrnelson.github.io/github-historical-uptime/
Actually to me the answer is Ms made them get more accurate in their graph. It was definitely not Rick solid in 2015-2018
https://news.ycombinator.com/item?id=14452011
https://techcrunch.com/2017/07/31/github-goes-down-and-takes...
Another line on that graph should probably be "January 7, 2019: GitHub offers unlimited free private repos". I can't imagine that helps with service stability.
That is a pretty wild graph
Actually to me the answer is Ms made them get more accurate in their graph. It was definitely not Rick solid in 2015-2018
https://news.ycombinator.com/item?id=14452011
https://techcrunch.com/2017/07/31/github-goes-down-and-takes...