

Exactly this. It checks periodically if a newer image for the tag of the container is available (e.g. vaultwarden:latest) and tells you about it. You can setup mail, sms, Teams, you name it.
So then you know a new version is available, can check the changelog and decide if the update is worth it.
It never was planned as a sequel/reboot of Prey by the studio. The publisher insisted on the name in hopes of more revenue from „long time fans“.