diff --git a/apps/emqx/src/emqx_alarm.erl b/apps/emqx/src/emqx_alarm.erl
index ab3e2d702..44b005faa 100644
--- a/apps/emqx/src/emqx_alarm.erl
+++ b/apps/emqx/src/emqx_alarm.erl
@@ -28,7 +28,7 @@
 -boot_mnesia({mnesia, [boot]}).
 -copy_mnesia({mnesia, [copy]}).
 
--export([pre_config_update/2]).
+-export([post_config_update/3]).
 
 -export([ start_link/0
         , stop/0
@@ -151,14 +151,9 @@ get_alarms(activated) ->
 get_alarms(deactivated) ->
     gen_server:call(?MODULE, {get_alarms, deactivated}).
 
-pre_config_update(#{<<"validity_period">> := Period0} = NewConf, OldConf) ->
-    ?MODULE ! {update_timer, hocon_postprocess:duration(Period0)},
-    merge(OldConf, NewConf);
-pre_config_update(NewConf, OldConf) ->
-    merge(OldConf, NewConf).
-
-merge(undefined, New) -> New;
-merge(Old, New) -> maps:merge(Old, New).
+post_config_update(_, #{validity_period := Period0}, _OldConf) ->
+    ?MODULE ! {update_timer, Period0},
+    ok.
 
 format(#activated_alarm{name = Name, message = Message, activate_at = At, details = Details}) ->
     Now = erlang:system_time(microsecond),
diff --git a/apps/emqx/test/emqx_alarm_SUITE.erl b/apps/emqx/test/emqx_alarm_SUITE.erl
index b8af41232..605300d2f 100644
--- a/apps/emqx/test/emqx_alarm_SUITE.erl
+++ b/apps/emqx/test/emqx_alarm_SUITE.erl
@@ -28,14 +28,14 @@ all() -> emqx_ct:all(?MODULE).
 init_per_testcase(t_size_limit, Config) ->
     emqx_ct_helpers:boot_modules(all),
     emqx_ct_helpers:start_apps([]),
-    {ok, _, _} = emqx:update_config([alarm], #{
+    {ok, _} = emqx:update_config([alarm], #{
             <<"size_limit">> => 2
         }),
     Config;
 init_per_testcase(t_validity_period, Config) ->
     emqx_ct_helpers:boot_modules(all),
     emqx_ct_helpers:start_apps([]),
-    {ok, _, _} = emqx:update_config([alarm], #{
+    {ok, _} = emqx:update_config([alarm], #{
             <<"validity_period">> => <<"1s">>
         }),
     Config;
diff --git a/apps/emqx_authz/src/emqx_authz.erl b/apps/emqx_authz/src/emqx_authz.erl
index 3f8177c51..6197cd685 100644
--- a/apps/emqx_authz/src/emqx_authz.erl
+++ b/apps/emqx_authz/src/emqx_authz.erl
@@ -69,12 +69,12 @@ update(Cmd, Rules) ->
 pre_config_update({move, Id, <<"top">>}, Conf) when is_list(Conf) ->
     {Index, _} = find_rule_by_id(Id),
     {List1, List2} = lists:split(Index, Conf),
-    [lists:nth(Index, Conf)] ++ lists:droplast(List1) ++ List2;
+    {ok, [lists:nth(Index, Conf)] ++ lists:droplast(List1) ++ List2};
 
 pre_config_update({move, Id, <<"bottom">>}, Conf) when is_list(Conf) ->
     {Index, _} = find_rule_by_id(Id),
     {List1, List2} = lists:split(Index, Conf),
-    lists:droplast(List1) ++ List2 ++ [lists:nth(Index, Conf)];
+    {ok, lists:droplast(List1) ++ List2 ++ [lists:nth(Index, Conf)]};
 
 pre_config_update({move, Id, #{<<"before">> := BeforeId}}, Conf) when is_list(Conf) ->
     {Index1, _} = find_rule_by_id(Id),
@@ -83,9 +83,9 @@ pre_config_update({move, Id, #{<<"before">> := BeforeId}}, Conf) when is_list(Co
     Conf2 = lists:nth(Index2, Conf),
 
     {List1, List2} = lists:split(Index2, Conf),
-    lists:delete(Conf1, lists:droplast(List1))
-    ++ [Conf1] ++ [Conf2]
-    ++ lists:delete(Conf1, List2);
+    {ok, lists:delete(Conf1, lists:droplast(List1))
+        ++ [Conf1] ++ [Conf2]
+        ++ lists:delete(Conf1, List2)};
 
 pre_config_update({move, Id, #{<<"after">> := AfterId}}, Conf) when is_list(Conf) ->
     {Index1, _} = find_rule_by_id(Id),
@@ -93,21 +93,21 @@ pre_config_update({move, Id, #{<<"after">> := AfterId}}, Conf) when is_list(Conf
     {Index2, _} = find_rule_by_id(AfterId),
 
     {List1, List2} = lists:split(Index2, Conf),
-    lists:delete(Conf1, List1)
-    ++ [Conf1]
-    ++ lists:delete(Conf1, List2);
+    {ok, lists:delete(Conf1, List1)
+        ++ [Conf1]
+        ++ lists:delete(Conf1, List2)};
 
 pre_config_update({head, Rules}, Conf) when is_list(Rules), is_list(Conf) ->
-    Rules ++ Conf;
+    {ok, Rules ++ Conf};
 pre_config_update({tail, Rules}, Conf) when is_list(Rules), is_list(Conf) ->
-    Conf ++ Rules;
+    {ok, Conf ++ Rules};
 pre_config_update({{replace_once, Id}, Rule}, Conf) when is_map(Rule), is_list(Conf) ->
     {Index, _} = find_rule_by_id(Id),
     {List1, List2} = lists:split(Index, Conf),
-    lists:droplast(List1) ++ [Rule] ++ List2;
+    {ok, lists:droplast(List1) ++ [Rule] ++ List2};
 pre_config_update({_, Rules}, _Conf) when is_list(Rules)->
     %% overwrite the entire config!
-    Rules.
+    {ok, Rules}.
 
 post_config_update(_, undefined, _Conf) ->
     ok;
diff --git a/apps/emqx_authz/src/emqx_authz_api.erl b/apps/emqx_authz/src/emqx_authz_api.erl
index 21519153a..a445c7016 100644
--- a/apps/emqx_authz/src/emqx_authz_api.erl
+++ b/apps/emqx_authz/src/emqx_authz_api.erl
@@ -449,7 +449,7 @@ rules(post, Request) ->
     {ok, Body, _} = cowboy_req:read_body(Request),
     RawConfig = jsx:decode(Body, [return_maps]),
     case emqx_authz:update(head, [RawConfig]) of
-        {ok, _, _} -> {204};
+        {ok, _} -> {204};
         {error, Reason} ->
             {400, #{code => <<"BAD_REQUEST">>,
                     messgae => atom_to_binary(Reason)}}
@@ -458,7 +458,7 @@ rules(put, Request) ->
     {ok, Body, _} = cowboy_req:read_body(Request),
     RawConfig = jsx:decode(Body, [return_maps]),
     case emqx_authz:update(replace, RawConfig) of
-        {ok, _, _} -> {204};
+        {ok, _} -> {204};
         {error, Reason} ->
             {400, #{code => <<"BAD_REQUEST">>,
                     messgae => atom_to_binary(Reason)}}
@@ -486,7 +486,7 @@ rule(put, Request) ->
     {ok, Body, _} = cowboy_req:read_body(Request),
     RawConfig = jsx:decode(Body, [return_maps]),
     case emqx_authz:update({replace_once, RuleId}, RawConfig) of
-        {ok, _, _} -> {204};
+        {ok, _} -> {204};
         {error, not_found_rule} ->
             {404, #{code => <<"NOT_FOUND">>,
                     messgae => <<"rule ", RuleId/binary, " not found">>}};
@@ -497,7 +497,7 @@ rule(put, Request) ->
 rule(delete, Request) ->
     RuleId = cowboy_req:binding(id, Request),
     case emqx_authz:update({replace_once, RuleId}, #{}) of
-        {ok, _, _} -> {204};
+        {ok, _} -> {204};
         {error, Reason} ->
             {400, #{code => <<"BAD_REQUEST">>,
                     messgae => atom_to_binary(Reason)}}
@@ -507,7 +507,7 @@ move_rule(post, Request) ->
     {ok, Body, _} = cowboy_req:read_body(Request),
     #{<<"position">> := Position} = jsx:decode(Body, [return_maps]),
     case emqx_authz:move(RuleId, Position) of
-        {ok, _, _} -> {204};
+        {ok, _} -> {204};
         {error, not_found_rule} ->
             {404, #{code => <<"NOT_FOUND">>,
                     messgae => <<"rule ", RuleId/binary, " not found">>}};
diff --git a/apps/emqx_authz/test/emqx_authz_SUITE.erl b/apps/emqx_authz/test/emqx_authz_SUITE.erl
index 85ef400f7..514b0d48b 100644
--- a/apps/emqx_authz/test/emqx_authz_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_SUITE.erl
@@ -33,17 +33,17 @@ groups() ->
 init_per_suite(Config) ->
     ok = emqx_config:init_load(emqx_authz_schema, ?CONF_DEFAULT),
     ok = emqx_ct_helpers:start_apps([emqx_authz]),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz]),
     ok.
 
 init_per_testcase(_, Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     Config.
 
 -define(RULE1, #{<<"principal">> => <<"all">>,
@@ -82,9 +82,9 @@ init_per_testcase(_, Config) ->
 %%------------------------------------------------------------------------------
 
 t_update_rule(_) ->
-    {ok, _, _} = emqx_authz:update(replace, [?RULE2]),
-    {ok, _, _} = emqx_authz:update(head, [?RULE1]),
-    {ok, _, _} = emqx_authz:update(tail, [?RULE3]),
+    {ok, _} = emqx_authz:update(replace, [?RULE2]),
+    {ok, _} = emqx_authz:update(head, [?RULE1]),
+    {ok, _} = emqx_authz:update(tail, [?RULE3]),
 
     Lists1 = emqx_authz:check_rules([?RULE1, ?RULE2, ?RULE3]),
     ?assertMatch(Lists1, emqx_config:get([authorization, rules], [])),
@@ -107,7 +107,7 @@ t_update_rule(_) ->
       }
     ] = emqx_authz:lookup(),
 
-    {ok, _, _} = emqx_authz:update({replace_once, Id3}, ?RULE4),
+    {ok, _} = emqx_authz:update({replace_once, Id3}, ?RULE4),
     Lists2 = emqx_authz:check_rules([?RULE1, ?RULE2, ?RULE4]),
     ?assertMatch(Lists2, emqx_config:get([authorization, rules], [])),
 
@@ -132,38 +132,38 @@ t_update_rule(_) ->
       }
     ] = emqx_authz:lookup(),
 
-    {ok, _, _} = emqx_authz:update(replace, []).
+    {ok, _} = emqx_authz:update(replace, []).
 
 t_move_rule(_) ->
-    {ok, _, _} = emqx_authz:update(replace, [?RULE1, ?RULE2, ?RULE3, ?RULE4]),
+    {ok, _} = emqx_authz:update(replace, [?RULE1, ?RULE2, ?RULE3, ?RULE4]),
     [#{annotations := #{id := Id1}},
      #{annotations := #{id := Id2}},
      #{annotations := #{id := Id3}},
      #{annotations := #{id := Id4}}
     ] = emqx_authz:lookup(),
 
-    {ok, _, _} = emqx_authz:move(Id4, <<"top">>),
+    {ok, _} = emqx_authz:move(Id4, <<"top">>),
     ?assertMatch([#{annotations := #{id := Id4}},
                   #{annotations := #{id := Id1}},
                   #{annotations := #{id := Id2}},
                   #{annotations := #{id := Id3}}
                  ], emqx_authz:lookup()),
 
-    {ok, _, _} = emqx_authz:move(Id1, <<"bottom">>),
+    {ok, _} = emqx_authz:move(Id1, <<"bottom">>),
     ?assertMatch([#{annotations := #{id := Id4}},
                   #{annotations := #{id := Id2}},
                   #{annotations := #{id := Id3}},
                   #{annotations := #{id := Id1}}
                  ], emqx_authz:lookup()),
 
-    {ok, _, _} = emqx_authz:move(Id3, #{<<"before">> => Id4}),
+    {ok, _} = emqx_authz:move(Id3, #{<<"before">> => Id4}),
     ?assertMatch([#{annotations := #{id := Id3}},
                   #{annotations := #{id := Id4}},
                   #{annotations := #{id := Id2}},
                   #{annotations := #{id := Id1}}
                  ], emqx_authz:lookup()),
 
-    {ok, _, _} = emqx_authz:move(Id2, #{<<"after">> => Id1}),
+    {ok, _} = emqx_authz:move(Id2, #{<<"after">> => Id1}),
     ?assertMatch([#{annotations := #{id := Id3}},
                   #{annotations := #{id := Id4}},
                   #{annotations := #{id := Id1}},
diff --git a/apps/emqx_authz/test/emqx_authz_api_SUITE.erl b/apps/emqx_authz/test/emqx_authz_api_SUITE.erl
index 23bcac31c..c4930ace6 100644
--- a/apps/emqx_authz/test/emqx_authz_api_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_api_SUITE.erl
@@ -76,13 +76,13 @@ init_per_suite(Config) ->
     ekka_mnesia:start(),
     emqx_mgmt_auth:mnesia(boot),
     ok = emqx_ct_helpers:start_apps([emqx_management, emqx_authz], fun set_special_configs/1),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
 
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz, emqx_management]),
     ok.
 
@@ -155,7 +155,7 @@ t_api(_) ->
     ok.
 
 t_move_rule(_) ->
-    {ok, _, _} = emqx_authz:update(replace, [?RULE1, ?RULE2, ?RULE3, ?RULE4]),
+    {ok, _} = emqx_authz:update(replace, [?RULE1, ?RULE2, ?RULE3, ?RULE4]),
     [#{annotations := #{id := Id1}},
      #{annotations := #{id := Id2}},
      #{annotations := #{id := Id3}},
diff --git a/apps/emqx_authz/test/emqx_authz_http_SUITE.erl b/apps/emqx_authz/test/emqx_authz_http_SUITE.erl
index ff04148d9..d50c7a43d 100644
--- a/apps/emqx_authz/test/emqx_authz_http_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_http_SUITE.erl
@@ -35,8 +35,8 @@ init_per_suite(Config) ->
 
     ok = emqx_ct_helpers:start_apps([emqx_authz]),
 
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
     Rules = [#{ <<"config">> => #{
                     <<"url">> => <<"https://fake.com:443/">>,
                     <<"headers">> => #{},
@@ -46,11 +46,11 @@ init_per_suite(Config) ->
                 <<"principal">> => <<"all">>,
                 <<"type">> => <<"http">>}
             ],
-    {ok, _, _} = emqx_authz:update(replace, Rules),
+    {ok, _} = emqx_authz:update(replace, Rules),
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz, emqx_resource]),
     meck:unload(emqx_resource),
     ok.
diff --git a/apps/emqx_authz/test/emqx_authz_mongo_SUITE.erl b/apps/emqx_authz/test/emqx_authz_mongo_SUITE.erl
index 5f179c0b0..ba18cb1cb 100644
--- a/apps/emqx_authz/test/emqx_authz_mongo_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_mongo_SUITE.erl
@@ -34,8 +34,8 @@ init_per_suite(Config) ->
     meck:expect(emqx_resource, remove, fun(_) -> ok end ),
 
     ok = emqx_ct_helpers:start_apps([emqx_authz]),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
     Rules = [#{ <<"config">> => #{
                         <<"mongo_type">> => <<"single">>,
                         <<"server">> => <<"127.0.0.1:27017">>,
@@ -47,11 +47,11 @@ init_per_suite(Config) ->
                 <<"find">> => #{<<"a">> => <<"b">>},
                 <<"type">> => <<"mongo">>}
             ],
-    {ok, _, _} = emqx_authz:update(replace, Rules),
+    {ok, _} = emqx_authz:update(replace, Rules),
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz, emqx_resource]),
     meck:unload(emqx_resource),
     ok.
diff --git a/apps/emqx_authz/test/emqx_authz_mysql_SUITE.erl b/apps/emqx_authz/test/emqx_authz_mysql_SUITE.erl
index 61e738041..81021f6e8 100644
--- a/apps/emqx_authz/test/emqx_authz_mysql_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_mysql_SUITE.erl
@@ -35,8 +35,8 @@ init_per_suite(Config) ->
 
     ok = emqx_ct_helpers:start_apps([emqx_authz]),
 
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
     Rules = [#{ <<"config">> => #{
                     <<"server">> => <<"127.0.0.1:27017">>,
                     <<"pool_size">> => 1,
@@ -49,11 +49,11 @@ init_per_suite(Config) ->
                 <<"principal">> => <<"all">>,
                 <<"sql">> => <<"abcb">>,
                 <<"type">> => <<"mysql">> }],
-    {ok, _, _} = emqx_authz:update(replace, Rules),
+    {ok, _} = emqx_authz:update(replace, Rules),
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz, emqx_resource]),
     meck:unload(emqx_resource).
 
diff --git a/apps/emqx_authz/test/emqx_authz_pgsql_SUITE.erl b/apps/emqx_authz/test/emqx_authz_pgsql_SUITE.erl
index 85e8a360a..7f7c236d0 100644
--- a/apps/emqx_authz/test/emqx_authz_pgsql_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_pgsql_SUITE.erl
@@ -35,8 +35,8 @@ init_per_suite(Config) ->
 
     ok = emqx_ct_helpers:start_apps([emqx_authz]),
 
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
     Rules = [#{ <<"config">> => #{
                     <<"server">> => <<"127.0.0.1:27017">>,
                     <<"pool_size">> => 1,
@@ -48,11 +48,11 @@ init_per_suite(Config) ->
                 },
                 <<"sql">> => <<"abcb">>,
                 <<"type">> => <<"pgsql">> }],
-    {ok, _, _} = emqx_authz:update(replace, Rules),
+    {ok, _} = emqx_authz:update(replace, Rules),
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz, emqx_resource]),
     meck:unload(emqx_resource).
 
diff --git a/apps/emqx_authz/test/emqx_authz_redis_SUITE.erl b/apps/emqx_authz/test/emqx_authz_redis_SUITE.erl
index cf0694449..f0a571dd8 100644
--- a/apps/emqx_authz/test/emqx_authz_redis_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_redis_SUITE.erl
@@ -35,8 +35,8 @@ init_per_suite(Config) ->
 
     ok = emqx_ct_helpers:start_apps([emqx_authz]),
 
-    {ok, _, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
-    {ok, _, _} = emqx:update_config([zones, default, authorization, enable], true),
+    {ok, _} = emqx:update_config([zones, default, authorization, cache, enable], false),
+    {ok, _} = emqx:update_config([zones, default, authorization, enable], true),
     Rules = [#{ <<"config">> => #{
                     <<"server">> => <<"127.0.0.1:27017">>,
                     <<"pool_size">> => 1,
@@ -47,11 +47,11 @@ init_per_suite(Config) ->
                 },
                 <<"cmd">> => <<"HGETALL mqtt_authz:%u">>,
                 <<"type">> => <<"redis">> }],
-    {ok, _, _} = emqx_authz:update(replace, Rules),
+    {ok, _} = emqx_authz:update(replace, Rules),
     Config.
 
 end_per_suite(_Config) ->
-    {ok, _, _} = emqx_authz:update(replace, []),
+    {ok, _} = emqx_authz:update(replace, []),
     emqx_ct_helpers:stop_apps([emqx_authz, emqx_resource]),
     meck:unload(emqx_resource).
 
diff --git a/apps/emqx_data_bridge/src/emqx_data_bridge_api.erl b/apps/emqx_data_bridge/src/emqx_data_bridge_api.erl
index 2039ab61f..dea3dcae8 100644
--- a/apps/emqx_data_bridge/src/emqx_data_bridge_api.erl
+++ b/apps/emqx_data_bridge/src/emqx_data_bridge_api.erl
@@ -124,7 +124,7 @@ format_api_reply(#{resource_type := Type, id := Id, config := Conf, status := St
 
 update_config_and_reply(Name, BridgeType, Config, Data) ->
     case emqx_data_bridge:update_config({update, ?BRIDGE(Name, BridgeType, Config)}) of
-        {ok, _, _} ->
+        {ok, _} ->
             {200, #{code => 0, data => format_api_reply(
                         emqx_resource_api:format_data(Data))}};
         {error, Reason} ->
@@ -133,7 +133,7 @@ update_config_and_reply(Name, BridgeType, Config, Data) ->
 
 delete_config_and_reply(Name) ->
     case emqx_data_bridge:update_config({delete, Name}) of
-        {ok, _, _} -> {200, #{code => 0, data => #{}}};
+        {ok, _} -> {200, #{code => 0, data => #{}}};
         {error, Reason} ->
             {500, #{code => 102, message => emqx_resource_api:stringnify(Reason)}}
     end.
diff --git a/apps/emqx_data_bridge/src/emqx_data_bridge_app.erl b/apps/emqx_data_bridge/src/emqx_data_bridge_app.erl
index 26128841b..859952480 100644
--- a/apps/emqx_data_bridge/src/emqx_data_bridge_app.erl
+++ b/apps/emqx_data_bridge/src/emqx_data_bridge_app.erl
@@ -32,12 +32,12 @@ stop(_State) ->
 
 %% internal functions
 pre_config_update({update, Bridge = #{<<"name">> := Name}}, OldConf) ->
-    [Bridge | remove_bridge(Name, OldConf)];
+    {ok, [Bridge | remove_bridge(Name, OldConf)]};
 pre_config_update({delete, Name}, OldConf) ->
-    remove_bridge(Name, OldConf);
+    {ok, remove_bridge(Name, OldConf)};
 pre_config_update(NewConf, _OldConf) when is_list(NewConf) ->
     %% overwrite the entire config!
-    NewConf.
+    {ok, NewConf}.
 
 remove_bridge(_Name, undefined) ->
     [];
diff --git a/apps/emqx_management/src/emqx_mgmt_api_configs.erl b/apps/emqx_management/src/emqx_mgmt_api_configs.erl
index 9a647e174..2c01276ce 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_configs.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_configs.erl
@@ -113,7 +113,7 @@ config(get, Req) ->
 
 config(put, Req) ->
     Path = conf_path(Req),
-    {ok, _, RawConf} = emqx:update_config(Path, http_body(Req),
+    {ok, #{raw_config := RawConf}} = emqx:update_config(Path, http_body(Req),
         #{rawconf_with_defaults => true}),
     {200, emqx_map_lib:deep_get(Path, emqx_map_lib:jsonable_map(RawConf))}.
 
@@ -121,7 +121,7 @@ config_reset(post, Req) ->
     %% reset the config specified by the query string param 'conf_path'
     Path = conf_path_reset(Req) ++ conf_path_from_querystr(Req),
     case emqx:reset_config(Path, #{}) of
-        {ok, _, _} -> {200};
+        {ok, _} -> {200};
         {error, Reason} ->
             {400, ?ERR_MSG(Reason)}
     end.
diff --git a/apps/emqx_prometheus/src/emqx_prometheus_api.erl b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
index 15762f5de..63b8b6a10 100644
--- a/apps/emqx_prometheus/src/emqx_prometheus_api.erl
+++ b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
@@ -113,7 +113,7 @@ prometheus(put, Request) ->
     {ok, Body, _} = cowboy_req:read_body(Request),
     Params = emqx_json:decode(Body, [return_maps]),
     Enable = maps:get(<<"enable">>, Params),
-    {ok, _, _} = emqx:update_config([prometheus], Params),
+    {ok, _} = emqx:update_config([prometheus], Params),
     enable_prometheus(Enable).
 
 % stats(_Bindings, Params) ->
diff --git a/apps/emqx_statsd/src/emqx_statsd_api.erl b/apps/emqx_statsd/src/emqx_statsd_api.erl
index 71e72d924..25f0d1879 100644
--- a/apps/emqx_statsd/src/emqx_statsd_api.erl
+++ b/apps/emqx_statsd/src/emqx_statsd_api.erl
@@ -91,7 +91,7 @@ statsd(put, Request) ->
     {ok, Body, _} = cowboy_req:read_body(Request),
     Params = emqx_json:decode(Body, [return_maps]),
     Enable = maps:get(<<"enable">>, Params),
-    {ok, _, _} = emqx:update_config([statsd], Params),
+    {ok, _} = emqx:update_config([statsd], Params),
     enable_statsd(Enable).
 
 enable_statsd(true) ->