Daybreak Games has announced that Just Survive (the zombie apocalypse side of H1Z1) will be closing down October 24.
The early access of the game was released in January 2015. The game was originally known as H1Z1, but in 2016, Daybreak decided to break H1Z1:King of the Kill and H1Z1:Just Survive into 2 separate games, with their own dedicated development teams.
Just Survive was partly a PvE game. It focused on surviving the zombie apocalypse, basebuilding, and of course, surviving other players.
H1Z1 will not be affected by this.
You can see the full announcement on the Just Survive site.