diff --git a/gradle/dependencies.gradle b/gradle/dependencies.gradle
index 8803835b4d..ad4df67aa3 100644
--- a/gradle/dependencies.gradle
+++ b/gradle/dependencies.gradle
@@ -84,7 +84,7 @@ ext {
   ]
   pluginVersions = [
     bnd: '5.2.0',
-    checkstyle: '8.37',
+    checkstyle: '8.38',
     coveralls: '2.8.4',
     coverity: '1.0.10',
     errorprone: '1.3.0',
diff --git a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/PolicyStats.java b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/PolicyStats.java
index 7294e1685c..e14d5451c4 100644
--- a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/PolicyStats.java
+++ b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/PolicyStats.java
@@ -72,12 +72,12 @@ public PolicyStats(String name) {
     this.metrics = new LinkedHashMap<>();
     this.stopwatch = Stopwatch.createUnstarted();
 
-    addMetric("Policy", this::name);
-    addPercentMetric("Hit rate", this::hitRate);
-    addMetric("Hits", this::hitCount);
-    addMetric("Misses", this::missCount);
-    addMetric("Requests", this::requestCount);
-    addMetric("Evictions", this::evictionCount);
+    addMetric(Metric.of("Policy", (Supplier<String>) this::name, OBJECT, true));
+    addMetric(Metric.of("Hit Rate", (DoubleSupplier) this::hitRate, PERCENT, true));
+    addMetric(Metric.of("Hits", (LongSupplier) this::hitCount, NUMBER, true));
+    addMetric(Metric.of("Misses", (LongSupplier) this::missCount, NUMBER, true));
+    addMetric(Metric.of("Requests", (LongSupplier) this::requestCount, NUMBER, true));
+    addMetric(Metric.of("Evictions", (LongSupplier) this::evictionCount, NUMBER, true));
     addPercentMetric("Admit rate",
         () -> (admittedCount + rejectedCount) == 0 ? 0 : admissionRate());
     addMetric(Metric.builder()
@@ -87,7 +87,7 @@ public PolicyStats(String name) {
         .type(NUMBER)
         .build());
     addMetric(Metric.builder()
-        .value((LongSupplier) this::requestsWeight)
+        .value((DoubleSupplier) this::weightedHitRate)
         .addToCharacteristics(WEIGHTED)
         .name("Weighted Hit Rate")
         .type(PERCENT)
@@ -301,11 +301,16 @@ public String toString() {
   public static abstract class Metric {
     public enum MetricType { NUMBER, PERCENT, OBJECT }
 
-    public abstract ImmutableSet<Characteristic> characteristics();
-    public abstract MetricType type();
-    public abstract Object value();
     public abstract String name();
+    public abstract Object value();
+    public abstract MetricType type();
+    public abstract boolean required();
+    public abstract ImmutableSet<Characteristic> characteristics();
 
+    @SuppressWarnings("PMD.ShortMethodName")
+    public static Metric of(String name, Object value, MetricType type, boolean required) {
+      return builder().name(name).value(value).type(type).required(required).build();
+    }
     public static PolicyStats_Metric_Builder builder() {
       return PolicyStats_Metric_Builder.builder();
     }
diff --git a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/Metrics.java b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/Metrics.java
index 5ee2985540..e47102a492 100644
--- a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/Metrics.java
+++ b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/Metrics.java
@@ -51,9 +51,14 @@ public String format(Metric metric) {
       return "";
     } else if (metric.value() instanceof LongSupplier) {
       long value = ((LongSupplier) metric.value()).getAsLong();
-      return longFormatter().apply(value);
+      return (value > 0) || metric.required()
+          ? longFormatter().apply(value)
+          : "";
     } else if (metric.value() instanceof DoubleSupplier) {
       double value = ((DoubleSupplier) metric.value()).getAsDouble();
+      if ((value == 0.0) && !metric.required()) {
+        return "";
+      }
       return (metric.type() == MetricType.PERCENT)
           ? percentFormatter().apply(value)
           : doubleFormatter().apply(value);
diff --git a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/TextReporter.java b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/TextReporter.java
index 86a48a284f..d7309c365a 100644
--- a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/TextReporter.java
+++ b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/TextReporter.java
@@ -88,7 +88,7 @@ protected Set<String> headers() {
           .flatMap(policyStats -> policyStats.metrics().values().stream())
           .filter(metric -> metric.characteristics().isEmpty()
               || metric.characteristics().stream().anyMatch(characteristics::contains))
-          .filter(metric -> !metrics().format(metric).isEmpty())
+          .filter(metric -> metric.required() || !metrics().format(metric).isEmpty())
           .map(Metric::name)
           .collect(toImmutableSet());
       headers = ImmutableSet.copyOf(Sets.intersection(all, used));
diff --git a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/csv/CsvReporter.java b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/csv/CsvReporter.java
index 0098acd63b..fd7e9668b6 100644
--- a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/csv/CsvReporter.java
+++ b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/csv/CsvReporter.java
@@ -61,9 +61,9 @@ protected String assemble(List<PolicyStats> results) {
   @Override
   protected Metrics newMetrics() {
     return Metrics.builder()
-        .percentFormatter(value -> (value == 0) ? "" : String.format("%.2f", 100 * value))
-        .doubleFormatter(value -> (value == 0) ? "" : String.format("%.2f", value))
-        .longFormatter(value -> (value == 0) ? "" : String.format("%d", value))
+        .percentFormatter(value -> String.format("%.2f", 100 * value))
+        .doubleFormatter(value -> String.format("%.2f", value))
+        .longFormatter(value -> String.format("%d", value))
         .objectFormatter(object -> {
           return (object instanceof Stopwatch)
               ? Long.toString(((Stopwatch) object).elapsed(TimeUnit.MILLISECONDS))
diff --git a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/table/TableReporter.java b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/table/TableReporter.java
index 4b6cf0f22e..c6d10dbed8 100644
--- a/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/table/TableReporter.java
+++ b/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/report/table/TableReporter.java
@@ -52,9 +52,9 @@ protected String assemble(List<PolicyStats> results) {
   @Override
   protected Metrics newMetrics() {
     return Metrics.builder()
-        .percentFormatter(value -> (value == 0) ? "" : String.format("%.2f %%", 100 * value))
-        .doubleFormatter(value -> (value == 0) ? "" : String.format("%.2f", value))
-        .longFormatter(value -> (value == 0) ? "" : String.format("%,d", value))
+        .percentFormatter(value -> String.format("%.2f %%", 100 * value))
+        .doubleFormatter(value -> String.format("%.2f", value))
+        .longFormatter(value -> String.format("%,d", value))
         .build();
   }
 }