feat(monitoring): Enable node exporter on almost all nodes

machines/storage01/prometheus.nix

@@ -1,8 +1,26 @@
-{ config, ... }:
+{
+  config,
+  nodes,
+  lib,
+  ...
+}:
 
 let
   host = "prometheus.dgnum.eu";
   port = 9091;
+
+  nodeExporterConfigs = lib.flatten (
+    lib.mapAttrsToList (
+      node:
+      { config, ... }:
+      lib.optional config.dgn-node-monitoring.enable {
+        targets = [ "${node}.dgnum:${builtins.toString config.dgn-node-monitoring.port}" ];
+        labels = {
+          host = node;
+        };
+      }
+    ) nodes
+  );
 in
 
 {
@@ -33,6 +51,10 @@ in
         job_name = "prometheus";
         static_configs = [ { targets = [ "localhost:9090" ]; } ];
       }
+      {
+        job_name = "node_exporter";
+        static_configs = nodeExporterConfigs;
+      }
     ];
   };