The systemd edge upgrades problem that we reported yesterday has been fixed, and the resolution updated in that blog post. If you have a systemd edge installation, it is safe to upgrade again. Please make sure that you use apk upgrade -aU, so that the latest systemd version is fetched from the repositories.
If you were affected by the broken systemd-257.7-r6 version, we recommend you join our main room on Matrix or IRC and ask for help.