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diff --git a/java/com/google/gerrit/metrics/dropwizard/HistogramImpl1.java b/java/com/google/gerrit/metrics/dropwizard/HistogramImpl1.java
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+++ b/java/com/google/gerrit/metrics/dropwizard/HistogramImpl1.java
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+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed 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 com.google.gerrit.metrics.dropwizard;
+
+import com.google.common.base.Function;
+import com.google.gerrit.metrics.Description;
+import com.google.gerrit.metrics.Field;
+import com.google.gerrit.metrics.Histogram1;
+
+/** Optimized version of {@link BucketedHistogram} for single dimension. */
+class HistogramImpl1<F1> extends BucketedHistogram implements BucketedMetric {
+  HistogramImpl1(DropWizardMetricMaker metrics, String name, Description desc, Field<F1> field1) {
+    super(metrics, name, desc, field1);
+  }
+
+  Histogram1<F1> histogram1() {
+    return new Histogram1<F1>() {
+      @Override
+      public void record(F1 field1, long value) {
+        total.record(value);
+        forceCreate(field1).record(value);
+      }
+
+      @Override
+      public void remove() {
+        doRemove();
+      }
+    };
+  }
+
+  @Override
+  String name(Object field1) {
+    @SuppressWarnings("unchecked")
+    Function<Object, String> fmt = (Function<Object, String>) fields[0].formatter();
+
+    return fmt.apply(field1).replace('/', '-');
+  }
+}