Admins will be upgrading ORNL GitLab Servers on Saturday, 16 May 2026, from 7 AM until 11 AM EST. Repositories will experience intermittent outages during this time.
- The `boot.readOnlyNixStore` has been removed. Control over bind mount options on `/nix/store` is now offered by the `boot.nixStoreMountOpts` option.
- Direct use of `pkgs.formats.systemd` has been deprecated, and should now be instantiated with `pkgs.formats.systemd { }` similarly to other items in `pkgs.formats`.
- The Postfix module has been updated and likely requires configuration changes:
- The `services.postfix.sslCert` and `sslKey` options were removed and you now need to configure
-[services.postfix.settings.main.smtpd_tls_chain_files](#opt-services.postfix.settings.main.smtpd_tls_chain_files) for server certificates,