Add Iceberg local file IO metrics (#19787)

* Added metrics for Iceberg file IO operations on Hadoop and renamed existing metrics to distinguish them from S3 metrics

graylog2-server/src/main/resources/prometheus-exporter.yml

@@ -1285,12 +1285,18 @@ metric_mappings:
     wildcard_extract_labels:
       - "delete_object"
 
-  - metric_name: "data_warehouse_iceberg_file_io_read"
-    match_pattern: "org.graylog.iceberg.read.*"
+  - metric_name: "data_warehouse_iceberg_file_io_s3_read"
+    match_pattern: "org.graylog.iceberg.file.io.s3.read.*"
     wildcard_extract_labels:
       - "read"
 
-  - metric_name: "data_warehouse_iceberg_file_io_write"
-    match_pattern: "org.graylog.iceberg.write.*"
+  - metric_name: "data_warehouse_iceberg_file_io_s3_write"
+    match_pattern: "org.graylog.iceberg.file.io.s3.write.*"
     wildcard_extract_labels:
       - "write"
+
+  - metric_name: "data_warehouse_iceberg_file_io_local_write"
+    match_pattern: "org.graylog.iceberg.file.io.local.write"
+
+  - metric_name: "data_warehouse_iceberg_file_io_local_read"
+    match_pattern: "org.graylog.iceberg.file.io.local.read"