update the gossiper

registry/gossip/proto/gossip.proto

@@ -8,12 +8,14 @@ message Update {
 	string id = 1;
 	// unix nano timestamp of update
 	uint64 timestamp = 2;
+	// time to live for entry
+	uint64 expires = 3;
 	// type of update; service
-	string type = 3;
+	string type = 4;
 	// what action is taken; add, del, put
-	string action = 4;
+	string action = 5;
 	// any other associated metadata about the data
-	map<string, string> metadata = 5;
+	map<string, string> metadata = 6;
 	// the payload data;
-	bytes data = 6;
+	bytes data = 7;
 }