- The `xplr` package has been updated from 0.18.0 to 0.19.0, which brings some breaking changes. See the [upstream release notes](https://github.com/sayanarijit/xplr/releases/tag/v0.19.0) for more details.

- Configuring multiple GitHub runners is now possible through `services.github-runners.<name>`. The options under `services.github-runner` remain, to configure a single runner.

- `github-runner` gained support for ephemeral runners and registrations using a personal access token (PAT) instead of a registration token. See `services.github-runner.ephemeral` and `services.github-runner.tokenFile` for details.

- A new module was added to provide hardware support for the Saleae Logic device family, providing the options `hardware.saleae-logic.enable` and `hardware.saleae-logic.package`.

- ZFS module will no longer allow hibernation by default.
  - This is a safety measure to prevent data loss cases like the ones described at [OpenZFS/260](https://github.com/openzfs/zfs/issues/260) and [OpenZFS/12842](https://github.com/openzfs/zfs/issues/12842).
  - Use the `boot.zfs.allowHibernation` option to configure this behaviour.

- Mastodon now automatically removes remote media attachments older than 30 days. This is configurable through `services.mastodon.mediaAutoRemove`.

- The Redis module now disables RDB persistence when `services.redis.servers.<name>.save = []` instead of using the Redis default.

- Neo4j was updated from version 3 to version 4. See upstream's [migration guide](https://neo4j.com/docs/upgrade-migration-guide/current/) for information on how to migrate your instance.

- The `networking.wireguard` module now can set the mtu on interfaces and tag its packets with an fwmark.

- The option `overrideStrategy` was added to the different systemd unit options (`systemd.services.<name>`, `systemd.sockets.<name>`, …) to allow enforcing the creation of a dropin file, rather than the main unit file, by setting it to `asDropin`.
  This is useful in cases where the existence of the main unit file is not known to Nix at evaluation time, for example when the main unit file is provided by adding a package to `systemd.packages`.
  See the fix proposed in [NixOS's systemd abstraction doesn't work with systemd template units](https://github.com/NixOS/nixpkgs/issues/135557#issuecomment-1295392470) for an example.

- The `polymc` package has been removed due to a rogue maintainer. It has been
  replaced by `prismlauncher`, a fork by the rest of the maintainers. For more
  details, see [the PR that made this change](https://github.com/NixOS/nixpkgs/pull/196624) and
  [the issue detailing the vulnerability](https://github.com/NixOS/nixpkgs/issues/196460).
  Users with existing installations should rename `~/.local/share/polymc` to
  `~/.local/share/PrismLauncher`. The main config file's path has also moved
  from `~/.local/share/polymc/polymc.cfg` to
  `~/.local/share/PrismLauncher/prismlauncher.cfg`.

- The `bloat` package has been updated from unstable-2022-03-31 to unstable-2022-10-25, which brings a breaking change. See [this upstream commit message](https://git.freesoftwareextremist.com/bloat/commit/?id=887ed241d64ba5db3fd3d87194fb5595e5ad7d73) for details.

- Synapse's systemd unit has been hardened.

- The module `services.grafana` was refactored to be compliant with [RFC 0042](https://github.com/NixOS/rfcs/blob/master/rfcs/0042-config-option.md). To be precise, this means that the following things have changed:
  - The newly introduced option [](#opt-services.grafana.settings) is an attribute-set that
    will be converted into Grafana's INI format. This means that the configuration from
    [Grafana's configuration reference](https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/)
    can be directly written as attribute-set in Nix within this option.
  - The option `services.grafana.extraOptions` has been removed. This option was an association
    of environment variables for Grafana. If you had an expression like