I can confirm this as well. I started seeing 500 errors intermittently when trying to view pages, so I checked status page and saw everything was green. Status page started showing the incident within about 3 minutes of when I started seeing issues. Clearly that's all based on happenstance of when I was landing on GitHub's website, but I have found that of all the status page's by large companies, GitHub's is almost always showing an incident as soon as I start noticing issues myself.