don't start a new reporter every time the registry is injected

src/main/java/com/commafeed/backend/metrics/MetricRegistryProducer.java

@@ -1,21 +1,30 @@
 package com.commafeed.backend.metrics;
 
+import javax.annotation.PostConstruct;
 import javax.enterprise.context.ApplicationScoped;
 import javax.enterprise.inject.Produces;
 
+import lombok.extern.slf4j.Slf4j;
+
 import com.codahale.metrics.JmxReporter;
 import com.codahale.metrics.MetricRegistry;
 
 @ApplicationScoped
+@Slf4j
 public class MetricRegistryProducer {
 
-	private final MetricRegistry registry = new MetricRegistry();
+	private MetricRegistry registry;
+
+	@PostConstruct
+	private void init() {
+		log.info("initializing metrics registry");
+		registry = new MetricRegistry();
+		JmxReporter.forRegistry(registry).build().start();
+		log.info("metrics registry initialized");
+	}
 
 	@Produces
 	public MetricRegistry produceMetricsRegistry() {
-		final JmxReporter reporter = JmxReporter.forRegistry(registry).build();
-		reporter.start();
 		return registry;
 	}
-
 }