Similarweb doesn't show any significant change:
https://www.similarweb.com/website/news.ycombinator.com#over...
Seems to be Alexa's bug, not HN's.
Seems to be Alexa's bug, not HN's.
It could be that there are thousands of sites with a similar number of visits. A small drop in number of visits might cause a huge drop in rank.
Also when a site has been around for long you have to start taking into account the 'population growth'; how many new people gained access to the web this month? How many among those are tech-savy people? Does this proportion increase or decrease over time?