I think it got the HN kiss of death. We need a new page about how to avoid this. Basic scaling skills I tells ya.
Until it runs out of ram just from the tcp connections.
400-600 RPS should suffice given a default Debian install running Apache with a TLS cert, given 300MB of base OS and 1.7G of RAM on a 2GB vps. Being very generous here as many are 512MB... otherwise it takes far less.