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22th chunk of `nixos/doc/manual/release-notes/rl-2205.section.md`
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- The polkit service, available at `security.polkit.enable`, is now disabled by default. It will automatically be enabled through services and desktop environments as needed.

- `mercury` was updated to 22.01.1, which has some breaking changes ([Mercury 22.01 news](https://dl.mercurylang.org/release/release-notes-22.01.html)).

- xfsprogs was update to version 5.15, which enables inobtcount and bigtime by default on filesystem creation. Support for these features was added in kernel 5.10 and deemed stable in kernel 5.15.
  If you want to be able to mount XFS filesystems created with this release of xfsprogs on kernel releases older than 5.10, you need to format them with `mkfs.xfs -m bigtime=0 -m inobtcount=0`.

- `services.xserver.desktopManager.xfce` now includes Xfce's screen locker, `xfce4-screensaver` that is enabled by default. You can disable it by setting `false` to [services.xserver.desktopManager.xfce.enableScreensaver](#opt-services.xserver.desktopManager.xfce.enableScreensaver).

- The `hadoop` package has added support for `aarch64-linux` and `aarch64-darwin` as of 3.3.1 ([#158613](https://github.com/NixOS/nixpkgs/pull/158613)).

- The `R` package now builds again on `aarch64-darwin` ([#158992](https://github.com/NixOS/nixpkgs/pull/158992)).

- The `nss` package was split into `nss_esr` and `nss_latest`, with `nss` being an alias for `nss_esr`. This was done to ease maintenance of `nss` and dependent high-profile packages like `firefox`.

- The default `scribus` version is now 1.5, while version 1.4 is still available as `scribus_1_4` ([#172700](https://github.com/NixOS/nixpkgs/pull/172700)).

- The Nextcloud module now supports to create a Mysql database automatically
  with `services.nextcloud.database.createLocally` enabled.

- The Nextcloud module now allows setting the value of the `max-age` directive of the `Strict-Transport-Security` HTTP header, which is now controlled by the `services.nextcloud.https` option, rather than `services.nginx.recommendedHttpHeaders`.

- The `spark3` package has been updated from 3.1.2 to 3.2.1 ([#160075](https://github.com/NixOS/nixpkgs/pull/160075)):
Title: NixOS 22.05: Notable Changes (Part 18)
Summary
This section details changes in NixOS 22.05, including updates to the polkit service, mercury, xfsprogs, XFCE screen locker, Hadoop, R package, nss package split, scribus, Nextcloud module (Mysql database creation and HTTP header), and Spark3.