https://www.pcgamer.com/apex-legends-dataminers-uncover-a-survival-mode-and-hover-tanks/

Diligent dataminers continue to root out all of Apex Legends' secrets. Along with the possibility of solo and duo modes, it looks like a survival mode could also be on the horizon. 

ApexDBR discovered references to both survival and team deathmatch modes in Apex Legends' files. At the moment, the game only contains a squad mode and single—albeit massive—map.