https://hackernews-insight.vercel.app/user-analysis
I know for a fact someone else did something similar recently but I can't find the link... but it gives an idea of what happened.
And recently there was the Reddit exodus as well, which for a few weeks you could tell that there are a lot of new users on the site asking questions and stuff.
But this might also just be a normal thing and a natural side-effect of having more users on the site.