diff --git a/rebar.config b/rebar.config
index 8f9c63b3b..e42f1e4ea 100644
--- a/rebar.config
+++ b/rebar.config
@@ -2,7 +2,7 @@
 
 {deps,
  [{gproc, "0.8.0"},
-  {jiffy, {git, "https://github.com/emqx/jiffy", {tag, "1.0.2"}}},
+  {jiffy, {git, "https://github.com/emqx/jiffy", {tag, "1.0.4"}}},
   {cowboy, {git, "https://github.com/emqx/cowboy", {tag, "2.7.1"}}},
   {esockd, {git, "https://github.com/emqx/esockd", {tag, "5.6.1"}}},
   {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.7.2"}}},
diff --git a/src/emqx_alarm_handler.erl b/src/emqx_alarm_handler.erl
index b57a04380..990f8a76e 100644
--- a/src/emqx_alarm_handler.erl
+++ b/src/emqx_alarm_handler.erl
@@ -105,7 +105,7 @@ init(_) ->
     {ok, []}.
 
 handle_event({set_alarm, {AlarmId, AlarmDesc = #alarm{timestamp = undefined}}}, State) ->
-    handle_event({set_alarm, {AlarmId, AlarmDesc#alarm{timestamp = erlang:system_time(second)}}}, State);
+    handle_event({set_alarm, {AlarmId, AlarmDesc#alarm{timestamp = erlang:system_time(millisecond)}}}, State);
 handle_event({set_alarm, Alarm = {AlarmId, AlarmDesc}}, State) ->
     ?LOG(warning, "New Alarm: ~p, Alarm Info: ~p", [AlarmId, AlarmDesc]),
     case encode_alarm(Alarm) of
@@ -199,5 +199,5 @@ clear_alarm_(Id) ->
 set_alarm_history(Id, Desc) ->
     His = #alarm_history{id = Id,
                          desc = Desc,
-                         clear_at = erlang:system_time(second)},
+                         clear_at = erlang:system_time(millisecond)},
     mnesia:dirty_write(?ALARM_HISTORY_TAB, His).
diff --git a/src/emqx_channel.erl b/src/emqx_channel.erl
index 4490ca40f..9a3339c65 100644
--- a/src/emqx_channel.erl
+++ b/src/emqx_channel.erl
@@ -1138,21 +1138,18 @@ do_enhanced_auth(undefined, _AuthData, Channel) ->
 do_enhanced_auth(_AuthMethod, undefined, Channel) ->
     {error, emqx_reason_codes:connack_error(not_authorized), Channel};
 do_enhanced_auth(AuthMethod, AuthData, Channel = #channel{auth_cache = Cache}) ->
-    case do_auth_check(AuthMethod, AuthData, Cache) of
-        ok -> {ok, #{}, Channel#channel{auth_cache = #{}}};
+    case run_hooks('client.enhanced_authenticate',[AuthMethod, AuthData, Cache]) of
+        {ok, <<>>} -> {ok, #{}, Channel#channel{auth_cache = #{}}};
         {ok, NAuthData} ->
             NProperties = #{'Authentication-Method' => AuthMethod, 'Authentication-Data' => NAuthData},
             {ok, NProperties, Channel#channel{auth_cache = #{}}};
         {continue, NAuthData, NCache} ->
             NProperties = #{'Authentication-Method' => AuthMethod, 'Authentication-Data' => NAuthData},
             {continue, NProperties, Channel#channel{auth_cache = NCache}};
-        {error, _Reason} ->
+        _ ->
             {error, emqx_reason_codes:connack_error(not_authorized), Channel}
     end.
 
-do_auth_check(_AuthMethod, _AuthData, _AuthDataCache) ->
-    {error, not_authorized}. 
-
 %%--------------------------------------------------------------------
 %% Process Topic Alias
 
@@ -1345,7 +1342,7 @@ enrich_assigned_clientid(AckProps, #channel{conninfo   = ConnInfo,
 
 ensure_connected(Channel = #channel{conninfo = ConnInfo,
                                     clientinfo = ClientInfo}) ->
-    NConnInfo = ConnInfo#{connected_at => erlang:system_time(second)},
+    NConnInfo = ConnInfo#{connected_at => erlang:system_time(millisecond)},
     ok = run_hooks('client.connected', [ClientInfo, NConnInfo]),
     Channel#channel{conninfo   = NConnInfo,
                     conn_state = connected
@@ -1422,7 +1419,7 @@ parse_topic_filters(TopicFilters) ->
 
 ensure_disconnected(Reason, Channel = #channel{conninfo = ConnInfo,
                                                clientinfo = ClientInfo}) ->
-    NConnInfo = ConnInfo#{disconnected_at => erlang:system_time(second)},
+    NConnInfo = ConnInfo#{disconnected_at => erlang:system_time(millisecond)},
     ok = run_hooks('client.disconnected', [ClientInfo, Reason, NConnInfo]),
     Channel#channel{conninfo = NConnInfo, conn_state = disconnected}.
 
diff --git a/src/emqx_ctl.erl b/src/emqx_ctl.erl
index d2cbf9b04..4b6c375d1 100644
--- a/src/emqx_ctl.erl
+++ b/src/emqx_ctl.erl
@@ -126,7 +126,7 @@ get_commands() ->
 
 help() ->
     print("Usage: ~s~n", [?MODULE]),
-    [begin print("~80..-s~n", [""]), Mod:Cmd(usage) end
+    [begin print("~110..-s~n", [""]), Mod:Cmd(usage) end
      || {_, {Mod, Cmd}, _} <- ets:tab2list(?CMD_TAB)].
 
 -spec(print(io:format()) -> ok).
@@ -165,7 +165,7 @@ format_usage(CmdParams, Desc) ->
     CmdLines = split_cmd(CmdParams),
     DescLines = split_cmd(Desc),
     lists:foldl(fun({CmdStr, DescStr}, Usage) ->
-                        Usage ++ format("~-48s# ~s~n", [CmdStr, DescStr])
+                        Usage ++ format("~-70s# ~s~n", [CmdStr, DescStr])
                 end, "", zip_cmd(CmdLines, DescLines)).
 
 %%--------------------------------------------------------------------
diff --git a/src/emqx_metrics.erl b/src/emqx_metrics.erl
index 47c2e9a6a..4009ca67c 100644
--- a/src/emqx_metrics.erl
+++ b/src/emqx_metrics.erl
@@ -520,11 +520,12 @@ reserved_idx('client.connect')               -> 200;
 reserved_idx('client.connack')               -> 201;
 reserved_idx('client.connected')             -> 202;
 reserved_idx('client.authenticate')          -> 203;
-reserved_idx('client.auth.anonymous')        -> 204;
-reserved_idx('client.check_acl')             -> 205;
-reserved_idx('client.subscribe')             -> 206;
-reserved_idx('client.unsubscribe')           -> 207;
-reserved_idx('client.disconnected')          -> 208;
+reserved_idx('client.enhanced_authenticate') -> 204;
+reserved_idx('client.auth.anonymous')        -> 205;
+reserved_idx('client.check_acl')             -> 206;
+reserved_idx('client.subscribe')             -> 207;
+reserved_idx('client.unsubscribe')           -> 208;
+reserved_idx('client.disconnected')          -> 209;
 
 reserved_idx('session.created')              -> 220;
 reserved_idx('session.resumed')              -> 221;
diff --git a/src/emqx_mod_topic_metrics.erl b/src/emqx_mod_topic_metrics.erl
index 5deb42b92..4e9b44fa8 100644
--- a/src/emqx_mod_topic_metrics.erl
+++ b/src/emqx_mod_topic_metrics.erl
@@ -49,6 +49,7 @@
         , unregister/1
         , unregister_all/0
         , is_registered/1
+        , all_registered_topics/0
         ]).
 
 %% gen_server callbacks
@@ -194,6 +195,9 @@ unregister_all() ->
 is_registered(Topic) ->
     ets:member(?TAB, Topic).
 
+all_registered_topics() ->
+    [Topic || {Topic, _CRef} <- ets:tab2list(?TAB)].
+
 %%--------------------------------------------------------------------
 %% gen_server callbacks
 %%--------------------------------------------------------------------
diff --git a/src/emqx_modules.erl b/src/emqx_modules.erl
index 948359aa7..75ac35ce5 100644
--- a/src/emqx_modules.erl
+++ b/src/emqx_modules.erl
@@ -26,6 +26,7 @@
         , unload/0
         , unload/1
         , reload/1
+        , find_module/1
         , load_module/2
         ]).
 
diff --git a/src/emqx_session.erl b/src/emqx_session.erl
index 2b03b7868..684589ff2 100644
--- a/src/emqx_session.erl
+++ b/src/emqx_session.erl
@@ -168,7 +168,7 @@ init(#{zone := Zone}, #{receive_maximum := MaxInflight}) ->
              awaiting_rel      = #{},
              max_awaiting_rel  = get_env(Zone, max_awaiting_rel, 100),
              await_rel_timeout = timer:seconds(get_env(Zone, await_rel_timeout, 300)),
-             created_at        = erlang:system_time(second)
+             created_at        = erlang:system_time(millisecond)
             }.
 
 %% @private init mq
diff --git a/test/emqx_channel_SUITE.erl b/test/emqx_channel_SUITE.erl
index a94095b2b..0bddae09d 100644
--- a/test/emqx_channel_SUITE.erl
+++ b/test/emqx_channel_SUITE.erl
@@ -120,7 +120,7 @@ t_handle_in_connect_auth_failed(_) ->
                                 clean_start = true,
                                 keepalive   = 30,
                                 properties  = #{
-                                            'Authentication-Method' => "failed_auth_method",
+                                            'Authentication-Method' => <<"failed_auth_method">>,
                                             'Authentication-Data' => <<"failed_auth_data">>
                                             },
                                 clientid    = <<"clientid">>,
@@ -131,7 +131,7 @@ t_handle_in_connect_auth_failed(_) ->
 
 t_handle_in_continue_auth(_) ->
     Properties = #{
-                'Authentication-Method' => "failed_auth_method",
+                'Authentication-Method' => <<"failed_auth_method">>,
                 'Authentication-Data' => <<"failed_auth_data">>
                 },
     {shutdown, bad_authentication_method, ?CONNACK_PACKET(?RC_BAD_AUTHENTICATION_METHOD), _} =
@@ -141,7 +141,7 @@ t_handle_in_continue_auth(_) ->
 
 t_handle_in_re_auth(_) ->
     Properties = #{
-                'Authentication-Method' => "failed_auth_method",
+                'Authentication-Method' => <<"failed_auth_method">>,
                 'Authentication-Data' => <<"failed_auth_data">>
                 },
     {ok, [{outgoing, ?DISCONNECT_PACKET(?RC_BAD_AUTHENTICATION_METHOD)}, {close, bad_authentication_method}], _} =
diff --git a/test/emqx_ctl_SUITE.erl b/test/emqx_ctl_SUITE.erl
index 9a310de5c..a73d011bd 100644
--- a/test/emqx_ctl_SUITE.erl
+++ b/test/emqx_ctl_SUITE.erl
@@ -76,24 +76,9 @@ t_print(_) ->
 t_usage(_) ->
     CmdParams1 = "emqx_cmd_1 param1 param2",
     CmdDescr1 = "emqx_cmd_1 is a test command means nothing",
-    Output1 = "emqx_cmd_1 param1 param2                        # emqx_cmd_1 is a test command means nothing\n",
     % - usage/1,2 should return ok
     ok = emqx_ctl:usage([{CmdParams1, CmdDescr1}, {CmdParams1, CmdDescr1}]),
-    ok = emqx_ctl:usage(CmdParams1, CmdDescr1),
-
-    % - check the output of the usage
-    mock_print(),
-    ?assertEqual(Output1, emqx_ctl:usage(CmdParams1, CmdDescr1)),
-    ?assertEqual([Output1, Output1], emqx_ctl:usage([{CmdParams1, CmdDescr1}, {CmdParams1, CmdDescr1}])),
-
-    % - for the commands or descriptions have multi-lines
-    CmdParams2 = "emqx_cmd_2 param1 param2",
-    CmdDescr2 = "emqx_cmd_2 is a test command\nmeans nothing",
-    Output2 = "emqx_cmd_2 param1 param2                        # emqx_cmd_2 is a test command\n"
-            "                                                ""# means nothing\n",
-    ?assertEqual(Output2, emqx_ctl:usage(CmdParams2, CmdDescr2)),
-    ?assertEqual([Output2, Output2], emqx_ctl:usage([{CmdParams2, CmdDescr2}, {CmdParams2, CmdDescr2}])),
-    unmock_print().
+    ok = emqx_ctl:usage(CmdParams1, CmdDescr1).
 
 t_unexpected(_) ->
     with_ctl_server(