Release 2018_001 (2018-01-17)

NixOS platform

• Allow empty lines in /etc/local/firewall definitions.

• Bugfix: Allow DNS traffic during firewall reconfiguration.

• Update Graylog to 2.4.0 (#29574).

• Provide Slack/Mattermost output plugin for Graylog (#29574).

Gentoo platform

• Prevent breakage of /usr/bin/python symlink during VM bootstrapping (#29444).

• Decrease Ceph journal sync interval for improved storage performance (#29275).