WhatsApp is gradually rolling out two new features to iOS and Android users. Disappearing messages brings added privacy to WhatsApp chats by deleting messages automatically within seven days. There's also a new storage management feature that enables deletion of repetitive media in multiple forwarded chats. Future versions of the app may offer a Vacation Mode that does not de-archive chats when new messages arrive.
https://www.notebookcheck.net/WhatsApp-rolling-out-disappearing-messages-and-storage-management-tool-for-iOS-and-Android-new-Vacation-Mode-in-testing.502104.0.html