fix: some small fixes for prometheus

applications/prometheus.nix

@@ -21,7 +21,7 @@ with lib; let
       )
       nodes
     );
-    node = lib.attrsets.mapAttrsToList (key: value: "${value.config.deployment.targetHost}:${toString config.services.prometheus.exporters.node.port}") nodes;
+    node = lib.attrsets.mapAttrsToList (key: value: "${value.config.deployment.targetHost}:${toString value.config.services.prometheus.exporters.node.port}") nodes;
   };
 
   # clears any invalid entries
@@ -37,8 +37,10 @@ in {
         type = types.port;
         default = 9001;
       };
+    };
 
-      external.node = mkOption {
+    external = {
+      node = mkOption {
         type = types.listOf types.str;
         default = [];
         description = ''
@@ -46,12 +48,20 @@ in {
         '';
       };
     };
+
+    ports = {
+      node = mkOption {
+        type = types.port;
+        default = 9100;
+      };
+    };
   };
 
   config = mkMerge [
     {
       services.prometheus.exporters.node = {
         enable = true;
+        port = cfg.ports.node;
         openFirewall = true;
         # most collectors are on by default see https://github.com/prometheus/node_exporter for more options
         enabledCollectors = ["systemd" "processes"];
@@ -66,7 +76,7 @@ in {
             job_name = "node_exporter";
             static_configs = [
               {
-                targets = filter_empty (exporters.node ++ cfg.server.external.node);
+                targets = filter_empty (exporters.node ++ cfg.external.node);
               }
             ];
           }