Fixing @Beta tags

Change-Id: I93a3be9a81a8f29f7b1ce29b66f09c9bcd31e639
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DefaultTunnelStatistics.java b/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DefaultTunnelStatistics.java
index df1b383..cab9ae4 100644
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DefaultTunnelStatistics.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DefaultTunnelStatistics.java
@@ -16,12 +16,15 @@
 
 package org.onosproject.incubator.net.tunnel;
 
+import com.google.common.annotations.Beta;
+
 import java.time.Duration;
 import java.util.List;
 
 /**
  * Default implementation of immutable tunnel statistics.
  */
+@Beta
 public final class DefaultTunnelStatistics implements TunnelStatistics {
     private final TunnelId tunnelId;
     private final double bwUtilization;