Update kraft metric rules

Author: hvan

api/assets/kafka/jmx-exporter.yml

@@ -241,8 +241,8 @@ rules:
   - pattern: java.lang.+
   - pattern: java.nio.+
   # Export kraft metrics
-  - pattern: kafka.raft<type=raft-metrics, name=(.+)><>Value
-    name: kafka_raft_metrics_$1
+  - pattern: kafka.server<type=raft-metrics, name=(.+)><>Value
+    name: kafka_server_raft_metrics_$1
     cache: true
     labels: {}
     type: GAUGE