prometheus: basic metric export

nixosModules/prometheus-node.nix

@@ -0,0 +1,20 @@
+{
+  services.prometheus.exporters = {
+    node = {
+      enable = true;
+      openFirewall = true;
+      port = 9190;
+      enabledCollectors = [
+        # keep-sorted start
+        "cgroups"
+        "interrupts"
+        "softirqs"
+        "swap"
+        "systemd"
+        "tcpstat"
+        "wifi"
+        # keep-sorted end
+      ];
+    };
+  };
+}