use double values for gauges

Author: Marius Sturm

pom.xml

@@ -26,7 +26,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>1.7</maven.compiler.source>
         <maven.compiler.target>1.7</maven.compiler.target>
-        <graylog2.version>2.0.0</graylog2.version>
+        <graylog2.version>2.0.3</graylog2.version>
         <graylog2.plugin-dir>/usr/share/graylog-server/plugin</graylog2.plugin-dir>
         <metrics.version>3.1.2</metrics.version>
         <metrics.statsd.version>4.1.2</metrics.statsd.version>

src/main/java/org/graylog/outputs/metrics/MetricsOutput.java

@@ -31,6 +31,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.SortedSet;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -53,7 +54,8 @@ public class MetricsOutput implements MessageOutput {
     private StatsDReporter statsDReporter;
 
     private final MetricRegistry registry = new MetricRegistry();
-    private AtomicLongMap<String> metricBuffer = AtomicLongMap.create();
+//    private AtomicLongMap<String> metricBuffer = AtomicLongMap.create();
+    private ConcurrentHashMap<String, Double> metricBuffer = new ConcurrentHashMap<>();
     private List<String> metricFields;
 
     @Inject
@@ -143,7 +145,7 @@ public Number getValue() {
                         });
                     }
                     // Update metric
-                    metricBuffer.put(metricName, metricValue.longValue());
+                    metricBuffer.put(metricName, metricValue.doubleValue());
                     break;
                 case "counter":
                     final Counter counter = registry.counter(metricName);