Add event id to router events

router/watcher.go

@@ -39,6 +39,8 @@ func (t EventType) String() string {
 
 // Event is returned by a call to Next on the watcher.
 type Event struct {
+	// Unique id of the event
+	Id string
 	// Type defines type of event
 	Type EventType
 	// Timestamp is event timestamp