nixos/graylog: set default version to 6.0

nixos/doc/manual/release-notes/rl-2411.section.md

@@ -641,6 +641,9 @@
 - `python3Packages.nose` has been removed, as it has been deprecated and unmaintained for almost a decade and does not work on Python 3.12.
   Please switch to `pytest` or another test runner/framework.
 
+- `services.graylog.package` now defaults to `graylog-6_0` as previous default `graylog-5_1` is EOL and therefore removed.
+  Check the migration guides on [5.1→5.2](https://go2docs.graylog.org/5-2/upgrading_graylog/upgrading_to_graylog_5.2.x.htm) and [5.2→6.0](https://go2docs.graylog.org/6-0/upgrading_graylog/upgrading_to_graylog_6.0.x.html) for breaking changes.
+
 ## Other Notable Changes {#sec-release-24.11-notable-changes}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

nixos/modules/services/logging/graylog.nix

@@ -35,8 +35,8 @@ in
 
       package = lib.mkOption {
         type = lib.types.package;
-        default = if lib.versionOlder config.system.stateVersion "23.05" then pkgs.graylog-3_3 else pkgs.graylog-5_1;
-        defaultText = lib.literalExpression (if lib.versionOlder config.system.stateVersion "23.05" then "pkgs.graylog-3_3" else "pkgs.graylog-5_1");
+        default = pkgs.graylog-6_0;
+        defaultText = lib.literalExpression "pkgs.graylog-6_0";
         description = "Graylog package to use.";
       };