fix(kubevirt): use the correct earlyoom option name (#281)

services.earlyoom.freeMemThresholdPercent does not exist in this nixpkgs; the module exposes freeMemThreshold/freeSwapThreshold. Just enable earlyoom with its defaults (trigger at 10% free mem/swap).

lib/genKubeVirtHostModule.nix

@@ -58,11 +58,8 @@ in
 
   # zram itself is provided by modules/nixos/base/zram.nix (enabled by default).
   # Kill the greediest process before the host starts thrashing / gets OOM-killed.
-  services.earlyoom = {
-    enable = true;
-    freeMemThresholdPercent = 5;
-    freeSwapThresholdPercent = 5;
-  };
+  # (defaults: trigger at 10% free mem / swap, kill hard at half of that.)
+  services.earlyoom.enable = true;
 
   environment.systemPackages = with pkgs; [
     # Validate Hardware Virtualization Support via: