Fix node exporter failing to start

nixos/hosts/eidola/prometheus.nix

@@ -1,5 +1,6 @@
 _: let
   ipInternal = "10.13.1.1"; # TODO: hardcoding
+  inherit (import ../../modules/nebula/shared.nix) unit;
 in {
   services.prometheus.exporters = {
     node = {
@@ -8,4 +9,8 @@ in {
       enabledCollectors = ["systemd"];
     };
   };
+  systemd.services."prometheus-node-exporter" = {
+    wants = [unit];
+    after = [unit];
+  };
 }

nixos/modules/nebula/shared.nix

@@ -4,4 +4,5 @@ rec {
   # https://github.com/NixOS/nixpkgs/blob/nixos-24.05/nixos/modules/services/networking/nebula.nix
   interface = "nebula.${netName}";
   userGroup = "nebula-${netName}";
+  unit = "nebula@${netName}.service";
 }