minecraft: set prometheus exporter to port 9225, manage config via ConfigMap

cluster/applications/minecraft/prometheus-exporter-config.yaml

@@ -0,0 +1,35 @@
+---
+# minecraft-prometheus-exporter plugin configuration
+# Port set to 9225 to match Service/ServiceMonitor definitions.
+# Default is 9940 — must be explicitly set here or the plugin won't be scraped.
+# Mounted read-only at /data/plugins/PrometheusExporter/config.yml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: prometheus-exporter-config
+  namespace: minecraft
+  labels:
+    app.kubernetes.io/name: minecraft
+    app.kubernetes.io/component: papermc
+data:
+  config.yml: |
+    host: localhost
+    port: 9225
+    enable_metrics:
+      entities_total: true
+      villagers_total: true
+      loaded_chunks_total: true
+      jvm_memory: true
+      players_online_total: true
+      players_total: true
+      whitelisted_players: false
+      tps: true
+      world_size: true
+      jvm_threads: true
+      jvm_gc: true
+      tick_duration_median: true
+      tick_duration_average: true
+      tick_duration_min: false
+      tick_duration_max: true
+      player_online: false
+      player_statistic: false