Define host groups

lib/flake-helper.nix

@@ -4,6 +4,7 @@ rec {
   generateNixosSystem = {
     name,
     system ? "x86_64-linux",
+    group ? null,
   }: let
     localNixpkgs = nixpkgs.lib.attrByPath [ "nixpkgs-${name}" ] nixpkgs inputs;
   in localNixpkgs.lib.nixosSystem {
@@ -25,6 +26,7 @@ rec {
               nixos-exporter;
            })
         ];
+        clerie.monitoring = nixpkgs.lib.attrsets.optionalAttrs (group != null) { serviceLevel = group; };
       })
       solid-xmpp-alarm.nixosModules.solid-xmpp-alarm
       (../hosts + "/${name}/configuration.nix")
@@ -37,6 +39,9 @@ rec {
     deployment = {
       targetHost = "${name}.net.clerie.de";
       targetUser = null;
+      tags = let
+        group = nixpkgs.lib.attrByPath [ "clerie" "monitoring" "serviceLevel" ] null hostSystem.config;
+      in nixpkgs.lib.lists.optional (group != null) group;
     };
     nixpkgs.system = hostSystem.config.nixpkgs.system;
     imports = hostSystem._module.args.modules;