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2nd chunk of `nixos/doc/manual/release-notes/rl-1909.section.md`
eb1c18d9739f4debb8a7a0adc4e0ecd19fb52b38fc78ff070000000100000fe1
  **The following changes were enacted in `services.gnome3.core-shell.enable`**

  - `gnome-color-manager`

  - `orca`

  - `services.avahi.enable`

## New Services {#sec-release-19.09-new-services}

The following new services were added since the last release:

- `./programs/dwm-status.nix`

- The new `hardware.printers` module allows to declaratively configure CUPS printers via the `ensurePrinters` and `ensureDefaultPrinter` options. `ensurePrinters` will never delete existing printers, but will make sure that the given printers are configured as declared.

- There is a new [services.system-config-printer.enable](options.html#opt-services.system-config-printer.enable) and [programs.system-config-printer.enable](options.html#opt-programs.system-config-printer.enable) module for the program of the same name. If you previously had `system-config-printer` enabled through some other means you should migrate to using one of these modules.

  - `services.xserver.desktopManager.plasma5`

  - `services.xserver.desktopManager.gnome3`

  - `services.xserver.desktopManager.pantheon`

  - `services.xserver.desktopManager.mate` Note Mate uses `programs.system-config-printer` as it doesn't use it as a service, but its graphical interface directly.

- [services.blueman.enable](options.html#opt-services.blueman.enable) has been added. If you previously had blueman installed via `environment.systemPackages` please migrate to using the NixOS module, as this would result in an insufficiently configured blueman.

## Backward Incompatibilities {#sec-release-19.09-incompatibilities}

When upgrading from a previous release, please be aware of the following incompatible changes:

- Buildbot no longer supports Python 2, as support was dropped upstream in version 2.0.0. Configurations may need to be modified to make them compatible with Python 3.

- PostgreSQL now uses `/run/postgresql` as its socket directory instead of `/tmp`. So if you run an application like eg. Nextcloud, where you need to use the Unix socket path as the database host name, you need to change it accordingly.

- PostgreSQL 9.4 is scheduled EOL during the 19.09 life cycle and has been removed.

- The options `services.prometheus.alertmanager.user` and `services.prometheus.alertmanager.group` have been removed because the alertmanager service is now using systemd's [ DynamicUser mechanism](http://0pointer.net/blog/dynamic-users-with-systemd.html) which obviates these options.

- The NetworkManager systemd unit was renamed back from network-manager.service to NetworkManager.service for better compatibility with other applications expecting this name. The same applies to ModemManager where modem-manager.service is now called ModemManager.service again.

- The `services.nzbget.configFile` and `services.nzbget.openFirewall` options were removed as they are managed internally by the nzbget. The `services.nzbget.dataDir` option hadn't actually been used by the module for some time and so was removed as cleanup.

- The `services.mysql.pidDir` option was removed, as it was only used by the wordpress apache-httpd service to wait for mysql to have started up. This can be accomplished by either describing a dependency on mysql.service (preferred) or waiting for the (hardcoded) `/run/mysqld/mysql.sock` file to appear.

- The `services.emby.enable` module has been removed, see `services.jellyfin.enable` instead for a free software fork of Emby. See the Jellyfin documentation: [ Migrating from Emby to Jellyfin ](https://jellyfin.readthedocs.io/en/latest/administrator-docs/migrate-from-emby/)

- IPv6 Privacy Extensions are now enabled by default for undeclared interfaces. The previous behaviour was quite misleading --- even though the default value for `networking.interfaces.*.preferTempAddress` was `true`, undeclared interfaces would not prefer temporary addresses. Now, interfaces not mentioned in the config will prefer temporary addresses. EUI64 addresses can still be set as preferred by explicitly setting the option to `false` for the interface in question.
Title: NixOS 19.09: GNOME Core Shell Changes, New Services, and Backward Incompatibilities
Summary
This section details changes in GNOME's core shell, including the addition of gnome-color-manager, orca, and avahi service enablement. It outlines new services like `dwm-status.nix`, CUPS printer configuration via `hardware.printers`, and modules for `system-config-printer`, desktop managers, and `blueman`. It also lists backward incompatibilities, such as Buildbot's Python 2 removal, PostgreSQL's socket directory change, the removal of PostgreSQL 9.4, changes to Prometheus alertmanager, renaming of NetworkManager and ModemManager systemd units, and removal of options for nzbget, mysql, and emby, alongside the default enablement of IPv6 Privacy Extensions for undeclared interfaces.