- Starting with version 1.7.0, the project formerly named `CodiMD` is now named `HedgeDoc`. New installations will no longer use the old name for users, state directories and such, this needs to be considered when moving state to a more recent NixOS installation. Based on [system.stateVersion](options.html#opt-system.stateVersion), existing installations will continue to work.

- The fish-foreign-env package has been replaced with fishPlugins.foreign-env, in which the fish functions have been relocated to the `vendor_functions.d` directory to be loaded automatically.

- The prometheus json exporter is now managed by the prometheus community. Together with additional features some backwards incompatibilities were introduced. Most importantly the exporter no longer accepts a fixed command-line parameter to specify the URL of the endpoint serving JSON. It now expects this URL to be passed as an URL parameter, when scraping the exporter's `/probe` endpoint. In the prometheus scrape configuration the scrape target might look like this:

  ```
  http://some.json-exporter.host:7979/probe?target=https://example.com/some/json/endpoint
  ```

  Existing configuration for the exporter needs to be updated, but can partially be re-used. Documentation is available in the upstream repository and a small example for NixOS is available in the corresponding NixOS test.

  These changes also affect [services.prometheus.exporters.rspamd.enable](options.html#opt-services.prometheus.exporters.rspamd.enable), which is just a preconfigured instance of the json exporter.

  For more information, take a look at the [ official documentation](https://github.com/prometheus-community/json_exporter) of the json_exporter.

- Androidenv was updated, removing the `includeDocs` and `lldbVersions` arguments. Docs only covered a single version of the Android SDK, LLDB is now bundled with the NDK, and both are no longer available to download from the Android package repositories. Additionally, since the package lists have been updated, some older versions of Android packages may not be bundled. If you depend on older versions of Android packages, we recommend overriding the repo.

  Android packages are now loaded from a repo.json file created by parsing Android repo XML files. The arguments `repoJson` and `repoXmls` have been added to allow overriding the built-in androidenv repo.json with your own. Additionally, license files are now written to allow compatibility with Gradle-based tools, and the `extraLicenses` argument has been added to accept more SDK licenses if your project requires it. See the androidenv documentation for more details.

- The attribute `mpi` is now consistently used to provide a default, system-wide MPI implementation. The default implementation is openmpi, which has been used before by all derivations affects by this change. Note that all packages that have used `mpi ? null` in the input for optional MPI builds, have been changed to the boolean input parameter `useMpi` to enable building with MPI. Building all packages with `mpich` instead of the default `openmpi` can now be achieved like this:

  ```nix
  self: super:
  {
    mpi = super.mpich;
  }
  ```

- The Searx module has been updated with the ability to configure the service declaratively and uWSGI integration. The option `services.searx.configFile` has been renamed to [services.searx.settingsFile](options.html#opt-services.searx.settingsFile) for consistency with the new [services.searx.settings](options.html#opt-services.searx.settings). In addition, the `searx` uid and gid reservations have been removed since they were not necessary: the service is now running with a dynamically allocated uid.

- The libinput module has been updated with the ability to configure mouse and touchpad settings separately. The options in `services.xserver.libinput` have been renamed to `services.xserver.libinput.touchpad`, while there is a new `services.xserver.libinput.mouse` for mouse related configuration.