Add prometheus and node_exporter to grafana

services/grafana.nix

@@ -10,6 +10,22 @@
       };
     };
   };
+  services.prometheus = rec {
+    enable = true;
+    port = 9001;
+    exporters = {
+      node = {
+        enable = true;
+        enabledCollectors = [ "systemd" ];
+        port = 9002;
+      };
+    };
+    scrapeConfigs = [{
+      job_name = "legion";
+      static_configs =
+        [{ targets = [ "127.0.0.1:${toString exporters.node.port}" ]; }];
+    }];
+  };
   services.caddy.virtualHosts."grafana.xenia.me.uk".extraConfig =
     "reverse_proxy http://localhost:3000";
 }