nixos/prometheus-exporters/rspamd: drop (#507069)

- `rocmPackages_6` has been removed. `rocmPackages` has been updated to ROCm 7.x. Out of tree packages may rely on obsolete hipblas APIs or compile time constant warp size and need to be updated.

- `services.prometheus.exporters.rspamd` has been removed. It relied on the Rspamd /stat endpoint via the JSON exporter. You can use the Rspamd [/metrics](https://docs.rspamd.com/developers/protocol#controller-http-endpoints) endpoint directly instead.

- The Bash implementation of the `nixos-rebuild` program is removed. All switchable systems now use the Python rewrite. Any prior usage of `system.rebuild.enableNg` must now be removed. If you have any outstanding issues with the new implementation, please open an issue on GitHub.

- `services.desktopManager.gnome` no longer installs the Geary e-mail client since it is not part of the GNOME [core applications](https://apps.gnome.org/) list. Geary's position in the default favorite apps section has been replaced by GNOME Text Editor. To keep it installed, add `programs.geary.enable = true;` to your configuration.

        "rasdaemon"

        "redis"

        "restic"

        "rspamd"

        "rtl_433"

        "sabnzbd"

        "scaphandre"

        (lib.mkRemovedOptionModule [ "tor" ] ''

          The Tor exporter has been removed, as it was broken and unmaintained.

        '')

        (lib.mkRemovedOptionModule [ "rspamd" ] ''

          The Rspamd exporter has been removed. You can use the Rspamd /metrics endpoint directly instead:

          https://docs.rspamd.com/developers/protocol#controller-http-endpoints

        '')

      ];

    };

    description = "Prometheus exporter configuration";

{

  config,

  lib,

  pkgs,

  options,

  ...

}:

let

  cfg = config.services.prometheus.exporters.rspamd;

  inherit (lib)

    mkOption

    types

    replaceStrings

    mkRemovedOptionModule

    recursiveUpdate

    concatStringsSep

    literalExpression

    ;

  mkFile = conf: pkgs.writeText "rspamd-exporter-config.yml" (builtins.toJSON conf);

  generateConfig = extraLabels: {

    modules.default.metrics =

      (map

        (path: {

          name = "rspamd_${replaceStrings [ "[" "." " " "]" "\\" "'" ] [ "_" "_" "_" "" "" "" ] path}";

          path = "{ .${path} }";

          labels = extraLabels;

        })

        [

          "actions['add\\ header']"

          "actions['no\\ action']"

          "actions['rewrite\\ subject']"

          "actions['soft\\ reject']"

          "actions.greylist"

          "actions.reject"

          "bytes_allocated"

          "chunks_allocated"

          "chunks_freed"

          "chunks_oversized"

          "connections"

          "control_connections"

          "ham_count"

          "learned"

          "pools_allocated"

          "pools_freed"

          "read_only"

          "scanned"

          "shared_chunks_allocated"

          "spam_count"

          "total_learns"

        ]

      )

      ++ [

        {

          name = "rspamd_statfiles";

          type = "object";

          path = "{.statfiles[*]}";

          labels = recursiveUpdate {

            symbol = "{.symbol}";

            type = "{.type}";

          } extraLabels;

          values = {

            revision = "{.revision}";

            size = "{.size}";

            total = "{.total}";

            used = "{.used}";

            languages = "{.languages}";

            users = "{.users}";

          };

        }

      ];

  };

in

{

  port = 7980;

  extraOpts = {

    extraLabels = mkOption {

      type = types.attrsOf types.str;

      default = {

        host = config.networking.hostName;

      };

      defaultText = literalExpression "{ host = config.networking.hostName; }";

      example = literalExpression ''

        {

          host = config.networking.hostName;

          custom_label = "some_value";

        }

      '';

      description = "Set of labels added to each metric.";

    };

  };

  serviceOpts.serviceConfig.ExecStart = ''

    ${pkgs.prometheus-json-exporter}/bin/json_exporter \

      --config.file ${mkFile (generateConfig cfg.extraLabels)} \

      --web.listen-address "${cfg.listenAddress}:${toString cfg.port}" \

      ${concatStringsSep " \\\n  " cfg.extraFlags}

  '';

  imports = [

    (mkRemovedOptionModule [ "url" ] ''

      This option was removed. The URL of the rspamd metrics endpoint

      must now be provided to the exporter by prometheus via the url

      parameter `target'.

      In prometheus a scrape URL would look like this:

        http://some.rspamd-exporter.host:7980/probe?target=http://some.rspamd.host:11334/stat

      For more information, take a look at the official documentation

      (https://github.com/prometheus-community/json_exporter) of the json_exporter.

    '')

    {

      options.warnings = options.warnings;

      options.assertions = options.assertions;

    }

  ];

}

        '';

      };

    rspamd =

      { ... }:

      {

        exporterConfig = {

          enable = true;

        };

        metricProvider = {

          services.rspamd.enable = true;

        };

        exporterTest = ''

          wait_for_unit("rspamd.service")

          wait_for_unit("prometheus-rspamd-exporter.service")

          wait_for_open_port(11334)

          wait_for_open_port(7980)

          wait_until_succeeds(

              "curl -sSf 'localhost:7980/probe?target=http://localhost:11334/stat' | grep 'rspamd_scanned{host=\"rspamd\"} 0'"

          )

        '';

      };

    rtl_433 =

      { ... }:

      {