Fix checkstyle errors in metrics packages

Change-Id: I1f328d7aa252c2834490ac18be06b2f61f26f9b1
diff --git a/src/main/java/net/onrc/onos/core/metrics/OnosMetrics.java b/src/main/java/net/onrc/onos/core/metrics/OnosMetrics.java
index d163335..7749bae 100644
--- a/src/main/java/net/onrc/onos/core/metrics/OnosMetrics.java
+++ b/src/main/java/net/onrc/onos/core/metrics/OnosMetrics.java
@@ -261,6 +261,7 @@
      * caller needs to allocate its own Metric, but still register it with the
      * system.
      *
+     * @param <T> Metric type
      * @param component component the Metric is defined in
      * @param feature feature the Metric is defined in
      * @param metricName local name of the metric