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7th chunk of `nixos/doc/manual/release-notes/rl-1903.section.md`
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- The astah-community package was removed from nixpkgs due to it being discontinued and the downloads not being available anymore.

- The httpd service now saves log files with a .log file extension by default for easier integration with the logrotate service.

- The owncloud server packages and httpd subservice module were removed from nixpkgs due to the lack of maintainers.

- It is possible now to uze ZRAM devices as general purpose ephemeral block devices, not only as swap. Using more than 1 device as ZRAM swap is no longer recommended, but is still possible by setting `zramSwap.swapDevices` explicitly.

  ZRAM algorithm can be changed now.

  Changes to ZRAM algorithm are applied during `nixos-rebuild switch`, so make sure you have enough swap space on disk to survive ZRAM device rebuild. Alternatively, use `nixos-rebuild boot; reboot`.

- Flat volumes are now disabled by default in `hardware.pulseaudio`. This has been done to prevent applications, which are unaware of this feature, setting their volumes to 100% on startup causing harm to your audio hardware and potentially your ears.

  ::: {.note}
  With this change application specific volumes are relative to the master volume which can be adjusted independently, whereas before they were absolute; meaning that in effect, it scaled the device-volume with the volume of the loudest application.
  :::

- The [`ndppd`](https://github.com/DanielAdolfsson/ndppd) module now supports [all config options](options.html#opt-services.ndppd.enable) provided by the current upstream version as service options. Additionally the `ndppd` package doesn't contain the systemd unit configuration from upstream anymore, the unit is completely configured by the NixOS module now.

- New installs of NixOS will default to the Redmine 4.x series unless otherwise specified in `services.redmine.package` while existing installs of NixOS will default to the Redmine 3.x series.

- The [Grafana module](options.html#opt-services.grafana.enable) now supports declarative [datasource and dashboard](http://docs.grafana.org/administration/provisioning/) provisioning.

- The use of insecure ports on kubernetes has been deprecated. Thus options: `services.kubernetes.apiserver.port` and `services.kubernetes.controllerManager.port` has been renamed to `.insecurePort`, and default of both options has changed to 0 (disabled).
Title: NixOS Updates: Package Removals, ZRAM Improvements, Pulseaudio Changes, and Kubernetes Security Enhancements
Summary
This section details updates in NixOS, including the removal of astah-community and owncloud packages, and the httpd subservice module. ZRAM devices can now be used as general-purpose ephemeral block devices, and the ZRAM algorithm is configurable. Flat volumes are disabled by default in pulseaudio to prevent audio hardware damage. The ndppd module now supports all upstream config options, and the Grafana module allows declarative datasource and dashboard provisioning. Kubernetes insecure ports are deprecated and disabled by default.