dimas-b commented on code in PR #3616:
URL: https://github.com/apache/polaris/pull/3616#discussion_r2766343275


##########
polaris-core/src/main/java/org/apache/polaris/core/persistence/metrics/ScanMetricsRecord.java:
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@@ -0,0 +1,162 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.polaris.core.persistence.metrics;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import org.apache.polaris.immutables.PolarisImmutable;
+
+/**
+ * Backend-agnostic representation of an Iceberg scan metrics report.
+ *
+ * <p>This record captures all relevant metrics from an Iceberg {@code 
ScanReport} along with
+ * contextual information such as realm, catalog, and request correlation data.
+ */
+@PolarisImmutable
+public interface ScanMetricsRecord {
+
+  // === Identification ===
+
+  /** Unique identifier for this report (UUID). */
+  String reportId();
+
+  /** Multi-tenancy realm identifier. */
+  String realmId();
+
+  /** Internal catalog ID. */
+  String catalogId();
+
+  /** Human-readable catalog name. */
+  String catalogName();

Review Comment:
   I'm not completely sure about denormalizing table names into the metrics 
table. With renames, a different table may appear under the same name in the 
same namespace at different times... I tend to think it can easy become a 
correctness issue at query time.... IDs seem more resilient... WDYT?



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