>Dow breaking 30k isn’t Hacker News either

Not sure about dow specifically, but stories about stock market performance occasionally show up on the front page eg.

Trading halted as U.S. stocks plummet (axios.com)

S&P 500 Plunges 7%, Triggering Market-Wide Stock Trading Halt (bloomberg.com)

both on https://news.ycombinator.com/front?day=2020-03-09

A trading halt is an extraordinary event. Some particular asset or index reaching a value that happens to be a round number is not.

or every time Tesla does a thing: https://hn.algolia.com/?dateRange=all&prefix=true&query=tesl...