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9th chunk of `nixos/doc/manual/release-notes/rl-1909.section.md`
95a9fc00e50a701b94b79aadaa13181a32dad3e0a57520200000000100000e71
  Previous solution to this problem was either to use `lib.flip map` idiom or extract that anonymous mapping function to a named one. Both can still be used but `lib.forEach` is preferred over `lib.flip map`.

  The `/etc/sysctl.d/nixos.conf` file containing all the options set via [boot.kernel.sysctl](options.html#opt-boot.kernel.sysctl) was moved to `/etc/sysctl.d/60-nixos.conf`, as sysctl.d5 recommends prefixing all filenames in `/etc/sysctl.d` with a two-digit number and a dash to simplify the ordering of the files.

- We now install the sysctl snippets shipped with systemd.

  - Loose reverse path filtering

  - Source route filtering

  - `fq_codel` as a packet scheduler (this helps to fight bufferbloat)

  This also configures the kernel to pass core dumps to `systemd-coredump`, and restricts the SysRq key combinations to the sync command only. These sysctl snippets can be found in `/etc/sysctl.d/50-*.conf`, and overridden via [boot.kernel.sysctl](options.html#opt-boot.kernel.sysctl) (which will place the parameters in `/etc/sysctl.d/60-nixos.conf`).

- Core dumps are now processed by `systemd-coredump` by default. `systemd-coredump` behaviour can still be modified via `systemd.coredump.extraConfig`. To stick to the old behaviour (having the kernel dump to a file called `core` in the working directory), without piping it through `systemd-coredump`, set `systemd.coredump.enable` to `false`.

- `systemd.packages` option now also supports generators and shutdown scripts. Old `systemd.generator-packages` option has been removed.

- The `rmilter` package was removed with associated module and options due deprecation by upstream developer. Use `rspamd` in proxy mode instead.

- systemd cgroup accounting via the [systemd.enableCgroupAccounting](options.html#opt-systemd.enableCgroupAccounting) option is now enabled by default. It now also enables the more recent Block IO and IP accounting features.

- We no longer enable custom font rendering settings with `fonts.fontconfig.penultimate.enable` by default. The defaults from fontconfig are sufficient.

- The `crashplan` package and the `crashplan` service have been removed from nixpkgs due to crashplan shutting down the service, while the `crashplansb` package and `crashplan-small-business` service have been removed from nixpkgs due to lack of maintainer.

  The [redis module](options.html#opt-services.redis.enable) was hardcoded to use the `redis` user, `/run/redis` as runtime directory and `/var/lib/redis` as state directory. Note that the NixOS module for Redis now disables kernel support for Transparent Huge Pages (THP), because this features causes major performance problems for Redis, e.g. (https://redis.io/topics/latency).

- Using `fonts.enableDefaultFonts` adds a default emoji font `noto-fonts-emoji`.

  - `services.xserver.enable`

  - `programs.sway.enable`

  - `programs.way-cooler.enable`

  - `services.xrdp.enable`

- The `altcoins` categorization of packages has been removed. You now access these packages at the top level, ie. `nix-shell -p dogecoin` instead of `nix-shell -p altcoins.dogecoin`, etc.

- Ceph has been upgraded to v14.2.1. See the [release notes](https://ceph.com/releases/v14-2-0-nautilus-released/) for details. The mgr dashboard as well as osds backed by loop-devices is no longer explicitly supported by the package and module. Note: There's been some issues with python-cherrypy, which is used by the dashboard and prometheus mgr modules (and possibly others), hence 0000-dont-check-cherrypy-version.patch.

- `pkgs.weechat` is now compiled against `pkgs.python3`. Weechat also recommends [to use Python3 in their docs.](https://weechat.org/scripts/python3/)
Title: NixOS Updates: systemd-coredump, systemd.packages, rmilter Removal, Cgroup Accounting, Font Rendering, Removed Packages, Redis Module, Emoji Font, Altcoins, Ceph Upgrade, and Weechat Python3
Summary
This section details various updates in NixOS. These include transitioning to systemd-coredump for core dump processing, changes to systemd.packages, removal of rmilter, enabling systemd cgroup accounting by default, removing custom font rendering settings, removal of crashplan packages and service, updates to the Redis module, addition of a default emoji font when enabling Xserver or Wayland, removal of the altcoins package categorization, an upgrade to Ceph v14.2.1, and compiling pkgs.weechat against pkgs.python3.