refactor: config/hosts => hosts

hosts/imxyy-nix-server/grafana.nix

@@ -0,0 +1,43 @@
+{
+  services.grafana = {
+    enable = true;
+    settings = {
+      server = {
+        http_addr = "0.0.0.0";
+        http_port = 8090;
+        domain = "grafana.imxyy.top";
+      };
+    };
+  };
+  services.prometheus = {
+    enable = true;
+    port = 8091;
+    exporters = {
+      node = {
+        enable = true;
+        port = 8092;
+        enabledCollectors = [
+          "systemd"
+          "zfs"
+        ];
+      };
+    };
+    scrapeConfigs = [
+      {
+        job_name = "node";
+        static_configs = [
+          {
+            targets = [ "127.0.0.1:8092" ];
+          }
+        ];
+      }
+    ];
+  };
+  services.caddy.virtualHosts."grafana.imxyy.top" = {
+    extraConfig = ''
+      reverse_proxy :8090 {
+        header_up X-Real-IP {remote_host}
+      }
+    '';
+  };
+}