- The `documentation.nixos.options.allowDocBook` option was added to ease the transition to CommonMark option documentation. Setting this option to `false` causes an error for every option included in the manual that uses DocBook documentation; it defaults to `true` to preserve the previous behavior and will be removed once the transition to CommonMark is complete.
- The Redis module now persists each instance's configuration file in the state directory, in order to support some more advanced use cases like Sentinel.
- `protonup` has been aliased to and replaced by `protonup-ng` due to upstream not maintaining it.
- The udisks2 service, available at `services.udisks2.enable`, is now disabled by default. It will automatically be enabled through services and desktop environments as needed.
This also means that polkit will now actually be disabled by default. The default for `security.polkit.enable` was already flipped in the previous release, but udisks2 being enabled by default re-enabled it.
- Nextcloud has been updated to version **25**. Additionally the following things have changed
for Nextcloud in NixOS:
- For Nextcloud **>=24**, the default PHP version is 8.1.
- Nextcloud **23** has been removed since it will reach its [end of life in December 2022](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule/d76576a12a626d53305d480a6065b57cab705d3d).
- If `system.stateVersion` is **>=22.11**, Nextcloud 25 will be installed by default. For older versions,
Nextcloud 24 will be installed.
- Please ensure that you only upgrade one major release at a time! Nextcloud doesn't support
upgrades across multiple versions, i.e. an upgrade from **23** to **25** is only possible
when upgrading to **24** first.
- systemd-oomd is enabled by default. Depending on which systemd units have
`ManagedOOMSwap=kill` or `ManagedOOMMemoryPressure=kill`, systemd-oomd will
SIGKILL all the processes under the appropriate descendant cgroups when the
configured limits are exceeded. NixOS does currently not configure cgroups
with oomd by default, this can be enabled using
[systemd.oomd.enableRootSlice](options.html#opt-systemd.oomd.enableRootSlice),
[systemd.oomd.enableSystemSlice](options.html#opt-systemd.oomd.enableSystemSlice),
and [systemd.oomd.enableUserServices](options.html#opt-systemd.oomd.enableUserServices).
- The `tt-rss` service performs two database migrations when you first use its web UI after upgrade. Consider backing up its database before updating.
- The `pass-secret-service` package now includes systemd units from upstream, so adding it to the NixOS `services.dbus.packages` option will make it start automatically as a systemd user service when an application tries to talk to the libsecret D-Bus API.
- The Wordpress module now has support for installing language packs through a new option, `services.wordpress.sites.<site>.languages`.
- The default package for `services.mullvad-vpn.package` was changed to `pkgs.mullvad`, allowing cross-platform usage of Mullvad. `pkgs.mullvad` only contains the Mullvad CLI tool, so users who rely on the Mullvad GUI will want to change it back to `pkgs.mullvad-vpn`, or add `pkgs.mullvad-vpn` to their environment.
- PowerDNS has been updated from v4.6.2 to v4.7.2. Please be sure to review the [Upgrade Notes](https://doc.powerdns.com/authoritative/upgrading.html#to-4-7-0-or-master) provided by upstream before upgrading. Worth specifically noting is that the new Catalog Zones feature comes with a mandatory schema change for the GSQL database backends, which has to be manually applied.
- There is a new module for the `thunar` program (the Xfce file manager), which depends on the `xfconf` dbus service, and also has a dbus service and a systemd unit. The option `services.xserver.desktopManager.xfce.thunarPlugins` has been renamed to `programs.thunar.plugins`, and may be removed in a future release.
- There is a new module for `xfconf` (the Xfce configuration storage system), which has a dbus service.