GitHub outages seem to have happened a lot this year.
And the year before. My previous job even floated the idea to come back to onprem infra for this reason.
Open PR; someone comments-doesn’t show up no matter how many hard refreshes, browser restarts, etc. Push a commit to your branch - doesn’t show up in the PR, but shows up in the commit history. If you have auto-merge ticked, it might never merge even when it meets the conditions, and if the branch merges you won’t know, because again, the PR never updates and it still looks open.
I have these issues- in varying degrees of duration and severity- about once a week.