use reflect

catalogs/catalog-lakehouse-iceberg/src/main/java/com/datastrato/gravitino/catalog/lakehouse/iceberg/web/metrics/IcebergMetricsManager.java

@@ -32,7 +32,7 @@ public class IcebergMetricsManager {
   // Register IcebergMetricsStorage's short name to its full qualified class name in the map. So
   // that user doesn't need to specify the full qualified class name when creating an
   // IcebergMetricsStorage.
-  public static final ImmutableMap<String, String> ICEBERG_METRICS_STORAGES =
+  private static final ImmutableMap<String, String> ICEBERG_METRICS_STORAGES =
       ImmutableMap.of(
           MemoryMetricsStorage.ICEBERG_METRICS_STORAGE_MEMORY_NAME,
           MemoryMetricsStorage.class.getCanonicalName());