Fix registration of RocksDB metrics categories (#7879)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

besu/src/test/java/org/hyperledger/besu/cli/options/MetricsOptionsTest.java

@@ -14,12 +14,18 @@
  */
 package org.hyperledger.besu.cli.options;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 import org.hyperledger.besu.metrics.BesuMetricCategory;
 import org.hyperledger.besu.metrics.MetricCategoryRegistryImpl;
 import org.hyperledger.besu.metrics.StandardMetricCategory;
 import org.hyperledger.besu.metrics.prometheus.MetricsConfiguration;
 
+import java.util.EnumSet;
+import java.util.stream.Collectors;
+
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.junit.jupiter.MockitoExtension;
 
@@ -64,4 +70,22 @@ public class MetricsOptionsTest
   protected String[] getNonOptionFields() {
     return new String[] {"metricCategoryRegistry"};
   }
+
+  @Test
+  public void enableRocksDbCategories() {
+    final var rocksDbMetricsCategories =
+        EnumSet.of(
+            BesuMetricCategory.KVSTORE_ROCKSDB,
+            BesuMetricCategory.KVSTORE_ROCKSDB_STATS,
+            BesuMetricCategory.KVSTORE_PRIVATE_ROCKSDB,
+            BesuMetricCategory.KVSTORE_PRIVATE_ROCKSDB_STATS);
+
+    internalTestSuccess(
+        metricsConfBuilder -> {
+          assertThat(metricsConfBuilder.build().getMetricCategories())
+              .containsExactlyInAnyOrderElementsOf(rocksDbMetricsCategories);
+        },
+        "--metrics-categories",
+        rocksDbMetricsCategories.stream().map(Enum::name).collect(Collectors.joining(",")));
+  }
 }

metrics/core/src/main/java/org/hyperledger/besu/metrics/MetricCategoryRegistryImpl.java

@@ -40,7 +40,8 @@ public class MetricCategoryRegistryImpl implements MetricCategoryRegistry {
    * @param categoryEnum the category enum
    */
   public <T extends Enum<T> & MetricCategory> void addCategories(final Class<T> categoryEnum) {
-    EnumSet.allOf(categoryEnum).forEach(this::addMetricCategory);
+    EnumSet.allOf(categoryEnum)
+        .forEach(category -> metricCategories.put(category.name(), category));
   }
 
   /**