Add dingserver2

hosts/dingserver2/prometheus.nix

@@ -0,0 +1,28 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  services.grafana = {
+    enable = true;
+  };
+
+  services.prometheus = {
+    enable = true;
+    exporters = {
+    };
+
+    scrapeConfigs = [
+      {
+        job_name = "synapse";
+        metrics_path = "/_synapse/metrics";
+        static_configs = [
+          {
+            targets = ["localhost:9000"];
+          }
+        ];
+      }
+    ];
+  };
+}