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8th chunk of `nixos/doc/manual/release-notes/rl-1909.section.md`
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- Since version 0.1.19, `cargo-vendor` honors package includes that are specified in the `Cargo.toml` file of Rust crates. `rustPlatform.buildRustPackage` uses `cargo-vendor` to collect and build dependent crates. Since this change in `cargo-vendor` changes the set of vendored files for most Rust packages, the hash that use used to verify the dependencies, `cargoSha256`, also changes.

  The `cargoSha256` hashes of all in-tree derivations that use `buildRustPackage` have been updated to reflect this change. However, third-party derivations that use `buildRustPackage` may have to be updated as well.

- The `consul` package was upgraded past version `1.5`, so its deprecated legacy UI is no longer available.

- The default resample-method for PulseAudio has been changed from the upstream default `speex-float-1` to `speex-float-5`. Be aware that low-powered ARM-based and MIPS-based boards will struggle with this so you'll need to set `hardware.pulseaudio.daemon.config.resample-method` back to `speex-float-1`.

- The `phabricator` package and associated `httpd.extraSubservice`, as well as the `phd` service have been removed from nixpkgs due to lack of maintainer.

- The `mercurial` `httpd.extraSubservice` has been removed from nixpkgs due to lack of maintainer.

- The `trac` `httpd.extraSubservice` has been removed from nixpkgs because it was unmaintained.

- The `foswiki` package and associated `httpd.extraSubservice` have been removed from nixpkgs due to lack of maintainer.

- The `tomcat-connector` `httpd.extraSubservice` has been removed from nixpkgs.

- It's now possible to change configuration in [services.nextcloud](options.html#opt-services.nextcloud.enable) after the initial deploy since all config parameters are persisted in an additional config file generated by the module. Previously core configuration like database parameters were set using their imperative installer after creating `/var/lib/nextcloud`.

- There exists now `lib.forEach`, which is like `map`, but with arguments flipped. When mapping function body spans many lines (or has nested `map`s), it is often hard to follow which list is modified.

  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`).
Title: NixOS Package and Configuration Changes: Cargo-Vendor, Consul, PulseAudio, Removed Packages, Nextcloud, lib.forEach, Sysctl Configuration, and Systemd Sysctl Snippets
Summary
This section outlines several changes in NixOS. It includes updates to cargo-vendor affecting Rust package dependencies and cargoSha256 hashes, removal of the Consul legacy UI, a change in PulseAudio's resample-method, the removal of several packages (Phabricator, Mercurial, Trac, foswiki, tomcat-connector) due to maintenance issues. Furthermore, it describes changes to Nextcloud configuration, the introduction of `lib.forEach`, and modifications to sysctl configuration, including the addition of systemd sysctl snippets for improved network settings and core dump handling.