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16th chunk of `nixos/doc/manual/release-notes/rl-2405.section.md`
6d998f35e7e18e23b9970eb7b9b4c8678dd2d48f3b6281c20000000100000fd3
  - `overwriteProtocol` -> [`overwriteprotocol`](#opt-services.nextcloud.settings.overwriteprotocol),
  - `skeletonDirectory` -> [`skeletondirectory`](#opt-services.nextcloud.settings.skeletondirectory),
  - `globalProfiles` -> [`profile.enabled`](#opt-services.nextcloud.settings._profile.enabled_),
  - `extraTrustedDomains` -> [`trusted_domains`](#opt-services.nextcloud.settings.trusted_domains) and
  - `trustedProxies` -> [`trusted_proxies`](#opt-services.nextcloud.settings.trusted_proxies).

- `services.nginx` will no longer advertise HTTP/3 availability automatically. This must now be manually added, preferably to each location block.
  Example:

  ```nix
  {
    locations."/".extraConfig = ''
      add_header Alt-Svc 'h3=":$server_port"; ma=86400';
    '';
    locations."^~ /assets/".extraConfig = ''
      add_header Alt-Svc 'h3=":$server_port"; ma=86400';
    '';
  }
  ```

- `services.pgbouncer` now has systemd support enabled and will log to journald. The default setting for `services.pgbouncer.logFile` is now `null` to disable logging to a separate log file.

- `services.postgresql.ensureUsers._.ensurePermissions` has been removed as it is
  not declarative and is broken with newer postgresql versions. Consider using
  [](#opt-services.postgresql.ensureUsers._.ensureDBOwnership)
  instead or a tool that is more suited for managing the data inside a postgresql database.

- `services.redis.vmOverCommit` now defaults to `true` and no longer enforces Transparent Hugepages (THP) to be disabled. Redis only works with THP configured to `madvise` which is the kernel's default.

- `services.resolved.fallbackDns`
  - can now be used to disable the upstream fallback servers entirely by setting it to `[]`
  - to get previous behaviour of upstream defaults, set it to `null`
  - default value has changed from `[]` to `null`, in order to preserve default behaviour

- `services.vikunja` systemd service now uses `vikunja` as dynamic user instead of `vikunja-api`. Database users might need to be changed.

- `services.vikunja.setupNginx` setting has been removed. Users now need to set up the webserver configuration on their own with a proxy pass to the vikunja service.

- `services.vmagent` module deprecates `dataDir`, `group` and `user` settings in favor of the systemd-provided CacheDirectory and DynamicUser.

- `services.vmagent.remoteWriteUrl` setting has been renamed to `services.vmagent.remoteWrite.url` and now defaults to `null`.

- `services.zope2` has been removed, as `zope2` is unmaintained and was relying on Python 2.

- `spark2014` has been renamed to `gnatprove`. A version of `gnatprove` matching different GNAT versions is available from the different `gnatPackages` sets.

- `stalwart-mail` has been updated to v0.5.3, which includes [breaking changes](https://github.com/stalwartlabs/mail-server/blob/v0.5.3/UPGRADING.md).

- `system.etc.overlay.enable` option was added. If enabled, `/etc` is
  mounted via an overlayfs instead of being created by a custom perl script.

- `system.forbiddenDependenciesRegex` has been renamed to `system.forbiddenDependenciesRegexes` and now has the type of `listOf string` instead of `string` to accept multiple regexes.

- `systemd.oomd` module behavior has changed:

  - Raise ManagedOOMMemoryPressureLimit from 50% to 80%. This should make systemd-oomd kill things less often, and fix issues like [this](https://pagure.io/fedora-workstation/issue/358).
    Reference: [commit](https://src.fedoraproject.org/rpms/systemd/c/806c95e1c70af18f81d499b24cd7acfa4c36ffd6?branch=806c95e1c70af18f81d499b24cd7acfa4c36ffd6).

  - Remove swap policy. This helps prevent killing processes when user's swap is small.

  - Expand the memory pressure policy to `system.slice`, `user-.slice`, and all user-owned slices. Reference: [commit](https://src.fedoraproject.org/rpms/systemd/c/7665e1796f915dedbf8e014f0a78f4f576d609bb).

  - Rename `systemd.oomd.enableUserServices` to `systemd.oomd.enableUserSlices`.

- `systemd.sysusers.enable` option was added. If enabled, users and
Title: NixOS 24.05: Backward Incompatibilities (System and Other Services)
Summary
Backward incompatibilities in NixOS 24.05 involve changes to several services and system configurations. These include Nextcloud settings moving and renaming, nginx no longer auto-advertising HTTP/3, pgbouncer logging to journald, postgresql ensurePermissions removal, redis vmOverCommit defaulting to true, resolved fallbackDns behavior, vikunja using a dynamic user and removing setupNginx, vmagent deprecating and renaming settings, zope2 removal, spark2014 renaming to gnatprove, stalwart-mail updating with breaking changes, system.etc.overlay.enable addition, system.forbiddenDependenciesRegex renaming and type change, systemd.oomd module behavior changes, and systemd.sysusers.enable addition.