faet: add more monitoring to minecraft

modules/monitoring.nix

@@ -1,6 +1,20 @@
 { config, pkgs, ... }:
 
 {
+  # Minecraft Prometheus exporter (player count, server status, ping)
+  virtualisation.oci-containers.containers.mc-monitor = {
+    image = "itzg/mc-monitor:latest";
+    extraOptions = [ "--network=host" ];
+    dependsOn = [ "minecraft" ];
+    cmd = [ "export-for-prometheus" "--servers" "localhost:25565" "--port" "9150" ];
+  };
+
+  # Container metrics (CPU, memory, network, disk I/O per container)
+  services.cadvisor = {
+    enable = true;
+    port = 9180;
+  };
+
   services.prometheus = {
     enable = true;
     port = 9090;
@@ -40,6 +54,22 @@
         }];
         scrape_interval = "15s";
       }
+      {
+        job_name = "minecraft";
+        static_configs = [{
+          targets = [ "localhost:9150" ];
+          labels = { instance = "minecraft-server"; };
+        }];
+        scrape_interval = "15s";
+      }
+      {
+        job_name = "cadvisor";
+        static_configs = [{
+          targets = [ "localhost:9180" ];
+          labels = { instance = "minecraft-server"; };
+        }];
+        scrape_interval = "15s";
+      }
     ];
   };
 
@@ -68,6 +98,7 @@
         {
           name = "Prometheus";
           type = "prometheus";
+          uid = "prometheus";
           url = "http://localhost:9090";
           isDefault = true;
           editable = false;
@@ -76,9 +107,9 @@
 
       dashboards.settings.providers = [
         {
-          name = "Node Exporter Full";
-          options.path = "${pkgs.writeTextDir "dashboards/node-exporter-full.json"
-            (builtins.readFile ../configs/node-exporter-full.json)}/dashboards";
+          name = "Minecraft Server";
+          options.path = "${pkgs.writeTextDir "dashboards/minecraft.json"
+            (builtins.readFile ../configs/minecraft-dashboard.json)}/dashboards";
           options.foldersFromFilesStructure = false;
         }
       ];