Rename modules directory system to nixos

modules/nixos/web-services/victoriametrics.nix

@@ -0,0 +1,49 @@
+{ config, lib, ... }:
+let
+  cfg = config.custom.web-services.victoriametrics;
+in
+{
+  options.custom.web-services.victoriametrics = {
+    enable = lib.mkEnableOption "";
+    domain = lib.mkOption {
+      type = lib.types.nonEmptyStr;
+      default = "";
+    };
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 8428;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    users = {
+      users.victoriametrics = {
+        isSystemUser = true;
+        group = config.users.groups.victoriametrics.name;
+      };
+      groups.victoriametrics = { };
+    };
+
+    systemd.services.victoriametrics.serviceConfig = {
+      DynamicUser = lib.mkForce false;
+      User = config.users.users.victoriametrics.name;
+      Group = config.users.groups.victoriametrics.name;
+    };
+
+    services.victoriametrics = {
+      enable = true;
+      listenAddress = "localhost:${toString cfg.port}";
+      extraOptions = [
+        "-selfScrapeInterval=15s"
+        "-selfScrapeJob=victoriametrics"
+        "-selfScrapeInstance=${config.networking.hostName}"
+      ];
+    };
+
+    custom = {
+      services.caddy.virtualHosts.${cfg.domain}.port = cfg.port;
+
+      persistence.directories = [ "/var/lib/${config.services.victoriametrics.stateDir}" ];
+    };
+  };
+}