kevin-wu24 commented on code in PR #20021:
URL: https://github.com/apache/kafka/pull/20021#discussion_r2164259100


##########
metadata/src/test/java/org/apache/kafka/image/loader/metrics/MetadataLoaderMetricsTest.java:
##########
@@ -153,8 +161,43 @@ public void testSetValueOfCurrentControllerId() {
         }
     }
 
+    @Test
+    public void testFinalizedFeatureLevelMetrics() {
+        MetricsRegistry registry = new MetricsRegistry();
+        try {
+            try (FakeMetadataLoaderMetrics fakeMetrics = new 
FakeMetadataLoaderMetrics(registry)) {
+                @SuppressWarnings("unchecked")
+                Gauge<Short> finalizedMetadataVersion = (Gauge<Short>) registry
+                    .allMetrics()
+                    .get(metricName("MetadataLoader", "FinalizedLevel", 
"featureName=metadataVersion"));
+                @SuppressWarnings("unchecked")
+                Gauge<Short> finalizedKRaftVersion = (Gauge<Short>) registry
+                    .allMetrics()
+                    .get(metricName("MetadataLoader", "FinalizedLevel", 
"featureName=kraftVersion"));
+
+                assertEquals(MINIMUM_VERSION.featureLevel(), 
finalizedMetadataVersion.value());
+                assertEquals((short) 0, finalizedKRaftVersion.value());
+
+                
fakeMetrics.metrics.setFinalizedFeatureLevel(MetadataVersion.FEATURE_NAME, 
MetadataVersion.LATEST_PRODUCTION.featureLevel());
+                assertEquals(MetadataVersion.LATEST_PRODUCTION.featureLevel(), 
finalizedMetadataVersion.value());
+
+                
fakeMetrics.metrics.setFinalizedFeatureLevel(KRaftVersion.FEATURE_NAME, 
KRaftVersion.LATEST_PRODUCTION.featureLevel());
+                assertEquals(KRaftVersion.LATEST_PRODUCTION.featureLevel(), 
finalizedKRaftVersion.value());
+            }
+            ControllerMetricsTestUtils.assertMetricsForTypeEqual(registry, 
"kafka.server",
+                Set.of());
+        } finally {
+            registry.shutdown();
+        }
+    }
+
     private static MetricName metricName(String type, String name) {
         String mBeanName = String.format("kafka.server:type=%s,name=%s", type, 
name);
         return new MetricName("kafka.server", type, name, null, mBeanName);
     }
+
+    private static MetricName metricName(String type, String name, String 
scope) {
+        String mBeanName = String.format("kafka.server:type=%s,name=%s,%s", 
type, name, scope);
+        return new MetricName("kafka.server", type, name, scope, mBeanName);
+    }

Review Comment:
   I would like to leave the methods as is. I think combining them both into 
one variadic method is a bit harder to read.



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