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4th chunk of `nixos/doc/manual/release-notes/rl-1803.section.md`
ce5369fbda900044287b653392b5ced2a32a3f70b93bc6e40000000100000a23
  - The data directory `/var/lib/piwik` was renamed to `/var/lib/matomo`. All files will be moved automatically on first startup, but you might need to adjust your backup scripts.

  - The default `serverName` for the nginx configuration changed from `piwik.${config.networking.hostName}` to `matomo.${config.networking.hostName}.${config.networking.domain}` if `config.networking.domain` is set, `matomo.${config.networking.hostName}` if it is not set. If you change your `serverName`, remember you'll need to update the `trustedHosts[]` array in `/var/lib/matomo/config/config.ini.php` as well.

  - The `piwik` user was renamed to `matomo`. The service will adjust ownership automatically for files in the data directory. If you use unix socket authentication, remember to give the new `matomo` user access to the database and to change the `username` to `matomo` in the `[database]` section of `/var/lib/matomo/config/config.ini.php`.

  - If you named your database \`piwik\`, you might want to rename it to \`matomo\` to keep things clean, but this is neither enforced nor required.

- `nodejs-4_x` is end-of-life. `nodejs-4_x`, `nodejs-slim-4_x` and `nodePackages_4_x` are removed.

- The `pump.io` NixOS module was removed. It is now maintained as an [external module](https://github.com/rvl/pump.io-nixos).

- The Prosody XMPP server has received a major update. The following modules were renamed:

  - `services.prosody.modules.httpserver` is now `services.prosody.modules.http_files`

  - `services.prosody.modules.console` is now `services.prosody.modules.admin_telnet`

  Many new modules are now core modules, most notably `services.prosody.modules.carbons` and `services.prosody.modules.mam`.

  The better-performing `libevent` backend is now enabled by default.

  `withCommunityModules` now passes through the modules to `services.prosody.extraModules`. Use `withOnlyInstalledCommunityModules` for modules that should not be enabled directly, e.g `lib_ldap`.

- All prometheus exporter modules are now defined as submodules. The exporters are configured using `services.prometheus.exporters`.

## Other Notable Changes {#sec-release-18.03-notable-changes}

- ZNC option `services.znc.mutable` now defaults to `true`. That means that old configuration is not overwritten by default when update to the znc options are made.

- The option `networking.wireless.networks.<name>.auth` has been added for wireless networks with WPA-Enterprise authentication. There is also a new `extraConfig` option to directly configure `wpa_supplicant` and `hidden` to connect to hidden networks.
Title: NixOS 18.03: More Incompatibilities, Removals, and Notable Changes
Summary
This section details further backward-incompatible changes in NixOS 18.03, including continued changes relating to the renaming of Piwik to Matomo. It also notes the end-of-life removal of nodejs-4_x, removal of the pump.io NixOS module, renames of Prosody modules, updates to Prometheus exporter modules, and changes to ZNC and wireless network configuration options.