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14th chunk of `nixos/doc/manual/release-notes/rl-2105.section.md`
08305fc5ae665b4ac7f89cf9cc3fb775d0d17c277267ad140000000100000974
- `isync`: The `isync` compatibility wrapper was removed and the Master/Slave terminology has been deprecated and should be replaced with Far/Near in the configuration file.

- The nix-gc service now accepts randomizedDelaySec (default: 0) and persistent (default: true) parameters. By default nix-gc will now run immediately if it would have been triggered at least once during the time when the timer was inactive.

- The `rustPlatform.buildRustPackage` function is split into several hooks: cargoSetupHook to set up vendoring for Cargo-based projects, cargoBuildHook to build a project using Cargo, cargoInstallHook to install a project using Cargo, and cargoCheckHook to run tests in Cargo-based projects. With this change, mixed-language projects can use the relevant hooks within builders other than `buildRustPackage`. However, these changes also required several API changes to `buildRustPackage` itself:

  - The `target` argument was removed. Instead, `buildRustPackage` will always use the same target as the C/C++ compiler that is used.

  - The `cargoParallelTestThreads` argument was removed. Parallel tests are now disabled through `dontUseCargoParallelTests`.

- The `rustPlatform.maturinBuildHook` hook was added. This hook can be used with `buildPythonPackage` to build Python packages that are written in Rust and use Maturin as their build tool.

- Kubernetes has [deprecated docker](https://kubernetes.io/blog/2020/12/02/dont-panic-kubernetes-and-docker/) as container runtime. As a consequence, the Kubernetes module now has support for configuration of custom remote container runtimes and enables containerd by default. Note that containerd is more strict regarding container image OCI-compliance. As an example, images with CMD or ENTRYPOINT defined as strings (not lists) will fail on containerd, while working fine on docker. Please test your setup and container images with containerd prior to upgrading.

- The GitLab module now has support for automatic backups. A schedule can be set with the [services.gitlab.backup.startAt](options.html#opt-services.gitlab.backup.startAt) option.

- Prior to this release, systemd would also read system units from an undocumented `/etc/systemd-mutable/system` path. This path has been dropped from the defaults. That path (or others) can be re-enabled by adding it to the [boot.extraSystemdUnitPaths](options.html#opt-boot.extraSystemdUnitPaths) list.
Title: NixOS 21.05 Updates: Isync, Nix-GC, Rust Platform, Kubernetes, GitLab, Systemd
Summary
The `isync` compatibility wrapper was removed, and Master/Slave terminology is deprecated. The nix-gc service now accepts `randomizedDelaySec` and `persistent` parameters. The `rustPlatform.buildRustPackage` function is split into hooks with API changes, and `rustPlatform.maturinBuildHook` was added. Kubernetes now supports custom remote container runtimes and enables containerd by default. The GitLab module now has support for automatic backups via `services.gitlab.backup.startAt`. Systemd no longer reads system units from `/etc/systemd-mutable/system` by default.