diff --git a/apps/emqx_management/src/emqx_mgmt_api_plugin.erl b/apps/emqx_management/src/emqx_mgmt_api_plugins.erl
similarity index 99%
rename from apps/emqx_management/src/emqx_mgmt_api_plugin.erl
rename to apps/emqx_management/src/emqx_mgmt_api_plugins.erl
index a722c2149..a6dcbfc66 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_plugin.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_plugins.erl
@@ -13,7 +13,7 @@
 %% See the License for the specific language governing permissions and
 %% limitations under the License.
 %%--------------------------------------------------------------------
--module(emqx_mgmt_api_plugin).
+-module(emqx_mgmt_api_plugins).
 
 -behaviour(minirest_api).
 
@@ -65,7 +65,7 @@ schema("/plugins") ->
         'operationId' => list_plugins,
         get => #{
             description => "List all install plugins.<br>"
-            "Plugins starts in the order of the list from the top to the bottom. <br>"
+            "Plugins are launched in top-down order.<br>"
             "Using `POST /plugins/{name}/move` to change the boot order.",
             responses => #{
                 200 => hoconsc:array(hoconsc:ref(plugin))
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/demo_src b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/demo_src
deleted file mode 160000
index ddab50faf..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/demo_src
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit ddab50fafeed6b1faea70fc9ffd8c700d7e26ec1
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/README.md b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/README.md
deleted file mode 100644
index 3c87fd974..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/README.md
+++ /dev/null
@@ -1,21 +0,0 @@
-# emqx-plugin-template
-
-This is a template plugin for EMQ X >= 5.0.
-
-For EMQ X >= 4.3, please see branch emqx-v4
-
-For older EMQ X versions, plugin development is no longer maintained.
-
-## Release
-
-A EMQ X plugin release is a zip package including
-
-1. A JSON format metadata file
-2. A tar file with plugin's apps packed
-
-Execute `make rel` to have the package created like:
-
-```
-_build/default/emqx_plugrel/emqx_plugin_template-<vsn>.tar.gz
-```
-See EMQ X documents for details on how to deploy the plugin.
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/priv/config.hocon b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/priv/config.hocon
deleted file mode 100644
index 87844e8aa..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/priv/config.hocon
+++ /dev/null
@@ -1,4 +0,0 @@
-## This is a demo config in HOCON format
-## The same format used by EMQ X since 5.0
-
-magic_n = 42
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_cli_demo.erl b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_cli_demo.erl
deleted file mode 100644
index 6186f3aa7..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_cli_demo.erl
+++ /dev/null
@@ -1,26 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2020 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
-
--module(emqx_cli_demo).
-
--export([cmd/1]).
-
-cmd(["arg1", "arg2"]) ->
-    emqx_ctl:print("ok");
-
-cmd(_) ->
-    emqx_ctl:usage([{"cmd arg1 arg2", "cmd demo"}]).
-
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template.app.src b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template.app.src
deleted file mode 100644
index 609da62fd..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template.app.src
+++ /dev/null
@@ -1,14 +0,0 @@
-{application, emqx_plugin_template,
- [{description, "EMQ X Plugin Template"},
-  {vsn, "5.0.0"},
-  {modules, []},
-  {registered, [emqx_plugin_template_sup]},
-  {applications, [kernel,stdlib,map_sets]},
-  {mod, {emqx_plugin_template_app,[]}},
-  {env, []},
-  {licenses, ["Apache-2.0"]},
-  {maintainers, ["EMQ X Team <contact@emqx.io>"]},
-  {links, [{"Homepage", "https://emqx.io/"},
-           {"Github", "https://github.com/emqx/emqx-plugin-template"}
-          ]}
- ]}.
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template.erl b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template.erl
deleted file mode 100644
index 9e37120f3..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template.erl
+++ /dev/null
@@ -1,198 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2020 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
-
--module(emqx_plugin_template).
-
-%% for #message{} record
-%% no need for this include if we call emqx_message:to_map/1 to convert it to a map
--include_lib("emqx/include/emqx.hrl").
-
-%% for logging
--include_lib("emqx/include/logger.hrl").
-
--export([ load/1
-        , unload/0
-        ]).
-
-%% Client Lifecircle Hooks
--export([ on_client_connect/3
-        , on_client_connack/4
-        , on_client_connected/3
-        , on_client_disconnected/4
-        , on_client_authenticate/3
-        , on_client_check_acl/5
-        , on_client_subscribe/4
-        , on_client_unsubscribe/4
-        ]).
-
-%% Session Lifecircle Hooks
--export([ on_session_created/3
-        , on_session_subscribed/4
-        , on_session_unsubscribed/4
-        , on_session_resumed/3
-        , on_session_discarded/3
-        , on_session_takeovered/3
-        , on_session_terminated/4
-        ]).
-
-%% Message Pubsub Hooks
--export([ on_message_publish/2
-        , on_message_delivered/3
-        , on_message_acked/3
-        , on_message_dropped/4
-        ]).
-
-%% Called when the plugin application start
-load(Env) ->
-    emqx:hook('client.connect',      {?MODULE, on_client_connect, [Env]}),
-    emqx:hook('client.connack',      {?MODULE, on_client_connack, [Env]}),
-    emqx:hook('client.connected',    {?MODULE, on_client_connected, [Env]}),
-    emqx:hook('client.disconnected', {?MODULE, on_client_disconnected, [Env]}),
-    emqx:hook('client.authenticate', {?MODULE, on_client_authenticate, [Env]}),
-    emqx:hook('client.check_acl',    {?MODULE, on_client_check_acl, [Env]}),
-    emqx:hook('client.subscribe',    {?MODULE, on_client_subscribe, [Env]}),
-    emqx:hook('client.unsubscribe',  {?MODULE, on_client_unsubscribe, [Env]}),
-    emqx:hook('session.created',     {?MODULE, on_session_created, [Env]}),
-    emqx:hook('session.subscribed',  {?MODULE, on_session_subscribed, [Env]}),
-    emqx:hook('session.unsubscribed',{?MODULE, on_session_unsubscribed, [Env]}),
-    emqx:hook('session.resumed',     {?MODULE, on_session_resumed, [Env]}),
-    emqx:hook('session.discarded',   {?MODULE, on_session_discarded, [Env]}),
-    emqx:hook('session.takeovered',  {?MODULE, on_session_takeovered, [Env]}),
-    emqx:hook('session.terminated',  {?MODULE, on_session_terminated, [Env]}),
-    emqx:hook('message.publish',     {?MODULE, on_message_publish, [Env]}),
-    emqx:hook('message.delivered',   {?MODULE, on_message_delivered, [Env]}),
-    emqx:hook('message.acked',       {?MODULE, on_message_acked, [Env]}),
-    emqx:hook('message.dropped',     {?MODULE, on_message_dropped, [Env]}).
-
-%%--------------------------------------------------------------------
-%% Client Lifecircle Hooks
-%%--------------------------------------------------------------------
-
-on_client_connect(ConnInfo, Props, _Env) ->
-    %% this is to demo the usage of EMQ X's structured-logging macro
-    %% * Recommended to always have a `msg` field,
-    %% * Use underscore instead of space to help log indexers,
-    %% * Try to use static fields
-    ?SLOG(debug, #{msg => "demo_log_msg_on_client_connect",
-                   conninfo => ConnInfo,
-                   props => Props}),
-    {ok, Props}.
-
-on_client_connack(ConnInfo = #{clientid := ClientId}, Rc, Props, _Env) ->
-    io:format("Client(~s) connack, ConnInfo: ~p, Rc: ~p, Props: ~p~n",
-              [ClientId, ConnInfo, Rc, Props]),
-    {ok, Props}.
-
-on_client_connected(ClientInfo = #{clientid := ClientId}, ConnInfo, _Env) ->
-    io:format("Client(~s) connected, ClientInfo:~n~p~n, ConnInfo:~n~p~n",
-              [ClientId, ClientInfo, ConnInfo]).
-
-on_client_disconnected(ClientInfo = #{clientid := ClientId}, ReasonCode, ConnInfo, _Env) ->
-    io:format("Client(~s) disconnected due to ~p, ClientInfo:~n~p~n, ConnInfo:~n~p~n",
-              [ClientId, ReasonCode, ClientInfo, ConnInfo]).
-
-on_client_authenticate(_ClientInfo = #{clientid := ClientId}, Result, _Env) ->
-    io:format("Client(~s) authenticate, Result:~n~p~n", [ClientId, Result]),
-    {ok, Result}.
-
-on_client_check_acl(_ClientInfo = #{clientid := ClientId}, Topic, PubSub, Result, _Env) ->
-    io:format("Client(~s) check_acl, PubSub:~p, Topic:~p, Result:~p~n",
-              [ClientId, PubSub, Topic, Result]),
-    {ok, Result}.
-
-on_client_subscribe(#{clientid := ClientId}, _Properties, TopicFilters, _Env) ->
-    io:format("Client(~s) will subscribe: ~p~n", [ClientId, TopicFilters]),
-    {ok, TopicFilters}.
-
-on_client_unsubscribe(#{clientid := ClientId}, _Properties, TopicFilters, _Env) ->
-    io:format("Client(~s) will unsubscribe ~p~n", [ClientId, TopicFilters]),
-    {ok, TopicFilters}.
-
-%%--------------------------------------------------------------------
-%% Session Lifecircle Hooks
-%%--------------------------------------------------------------------
-
-on_session_created(#{clientid := ClientId}, SessInfo, _Env) ->
-    io:format("Session(~s) created, Session Info:~n~p~n", [ClientId, SessInfo]).
-
-on_session_subscribed(#{clientid := ClientId}, Topic, SubOpts, _Env) ->
-    io:format("Session(~s) subscribed ~s with subopts: ~p~n", [ClientId, Topic, SubOpts]).
-
-on_session_unsubscribed(#{clientid := ClientId}, Topic, Opts, _Env) ->
-    io:format("Session(~s) unsubscribed ~s with opts: ~p~n", [ClientId, Topic, Opts]).
-
-on_session_resumed(#{clientid := ClientId}, SessInfo, _Env) ->
-    io:format("Session(~s) resumed, Session Info:~n~p~n", [ClientId, SessInfo]).
-
-on_session_discarded(_ClientInfo = #{clientid := ClientId}, SessInfo, _Env) ->
-    io:format("Session(~s) is discarded. Session Info: ~p~n", [ClientId, SessInfo]).
-
-on_session_takeovered(_ClientInfo = #{clientid := ClientId}, SessInfo, _Env) ->
-    io:format("Session(~s) is takeovered. Session Info: ~p~n", [ClientId, SessInfo]).
-
-on_session_terminated(_ClientInfo = #{clientid := ClientId}, Reason, SessInfo, _Env) ->
-    io:format("Session(~s) is terminated due to ~p~nSession Info: ~p~n",
-              [ClientId, Reason, SessInfo]).
-
-%%--------------------------------------------------------------------
-%% Message PubSub Hooks
-%%--------------------------------------------------------------------
-
-%% Transform message and return
-on_message_publish(Message = #message{topic = <<"$SYS/", _/binary>>}, _Env) ->
-    {ok, Message};
-
-on_message_publish(Message, _Env) ->
-    io:format("Publish ~s~n", [emqx_message:to_map(Message)]),
-    {ok, Message}.
-
-on_message_dropped(#message{topic = <<"$SYS/", _/binary>>}, _By, _Reason, _Env) ->
-    ok;
-on_message_dropped(Message, _By = #{node := Node}, Reason, _Env) ->
-    io:format("Message dropped by node ~s due to ~s: ~p~n",
-              [Node, Reason, emqx_message:to_map(Message)]).
-
-on_message_delivered(_ClientInfo = #{clientid := ClientId}, Message, _Env) ->
-    io:format("Message delivered to client(~s): ~p~n",
-              [ClientId, emqx_message:to_map(Message)]),
-    {ok, Message}.
-
-on_message_acked(_ClientInfo = #{clientid := ClientId}, Message, _Env) ->
-    io:format("Message acked by client(~s): ~p~n",
-              [ClientId, emqx_message:to_map(Message)]).
-
-%% Called when the plugin application stop
-unload() ->
-    emqx:unhook('client.connect',      {?MODULE, on_client_connect}),
-    emqx:unhook('client.connack',      {?MODULE, on_client_connack}),
-    emqx:unhook('client.connected',    {?MODULE, on_client_connected}),
-    emqx:unhook('client.disconnected', {?MODULE, on_client_disconnected}),
-    emqx:unhook('client.authenticate', {?MODULE, on_client_authenticate}),
-    emqx:unhook('client.check_acl',    {?MODULE, on_client_check_acl}),
-    emqx:unhook('client.subscribe',    {?MODULE, on_client_subscribe}),
-    emqx:unhook('client.unsubscribe',  {?MODULE, on_client_unsubscribe}),
-    emqx:unhook('session.created',     {?MODULE, on_session_created}),
-    emqx:unhook('session.subscribed',  {?MODULE, on_session_subscribed}),
-    emqx:unhook('session.unsubscribed',{?MODULE, on_session_unsubscribed}),
-    emqx:unhook('session.resumed',     {?MODULE, on_session_resumed}),
-    emqx:unhook('session.discarded',   {?MODULE, on_session_discarded}),
-    emqx:unhook('session.takeovered',  {?MODULE, on_session_takeovered}),
-    emqx:unhook('session.terminated',  {?MODULE, on_session_terminated}),
-    emqx:unhook('message.publish',     {?MODULE, on_message_publish}),
-    emqx:unhook('message.delivered',   {?MODULE, on_message_delivered}),
-    emqx:unhook('message.acked',       {?MODULE, on_message_acked}),
-    emqx:unhook('message.dropped',     {?MODULE, on_message_dropped}).
-
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template_app.erl b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template_app.erl
deleted file mode 100644
index 5a4cabce8..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template_app.erl
+++ /dev/null
@@ -1,34 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2020 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
-
--module(emqx_plugin_template_app).
-
--behaviour(application).
-
--emqx_plugin(?MODULE).
-
--export([ start/2
-        , stop/1
-        ]).
-
-start(_StartType, _StartArgs) ->
-    {ok, Sup} = emqx_plugin_template_sup:start_link(),
-    emqx_plugin_template:load(application:get_all_env()),
-    {ok, Sup}.
-
-stop(_State) ->
-    emqx_plugin_template:unload().
-
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template_sup.erl b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template_sup.erl
deleted file mode 100644
index bd9961f3a..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/emqx_plugin_template-5.0.0/src/emqx_plugin_template_sup.erl
+++ /dev/null
@@ -1,30 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2020 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
-
--module(emqx_plugin_template_sup).
-
--behaviour(supervisor).
-
--export([start_link/0]).
-
--export([init/1]).
-
-start_link() ->
-    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
-
-init([]) ->
-    {ok, { {one_for_all, 0, 1}, []} }.
-
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/map_sets-1.1.0/src/map_sets.app.src b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/map_sets-1.1.0/src/map_sets.app.src
deleted file mode 100644
index 0025a8a7b..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/map_sets-1.1.0/src/map_sets.app.src
+++ /dev/null
@@ -1,9 +0,0 @@
-{application,map_sets,
-             [{description,"sets-like wrapper based on maps"},
-              {vsn,"1.1.0"},
-              {registered,[]},
-              {applications,[kernel,stdlib]},
-              {env,[]},
-              {modules,[]},
-              {links,[{"Github","https://github.com/k32/map_sets"}]},
-              {licenses,["public domain"]}]}.
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/map_sets-1.1.0/src/map_sets.erl b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/map_sets-1.1.0/src/map_sets.erl
deleted file mode 100644
index 8a001e9e4..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/map_sets-1.1.0/src/map_sets.erl
+++ /dev/null
@@ -1,179 +0,0 @@
-%% s/sets/map_sets/g
-%% Why? Because spead (This module piggybacks on `maps' module's BIFs)
--module(map_sets).
-
--export([ new/0
-        , is_set/1
-        , size/1
-        , to_list/1
-        , from_list/1
-        ]).
-
--export([ is_element/2
-        , add_element/2
-        , del_element/2
-        ]).
-
--export([ union/2
-        , union/1
-        , intersection/2
-        , intersection/1
-        ]).
-
--export([ is_disjoint/2
-        ]).
-
--export([ subtract/2
-        , is_subset/2
-        ]).
-
--export([ fold/3
-        , filter/2
-        ]).
-
--export_type([set/1, set/0]).
-
--type set(Key) :: #{Key => term()}.
--type set() :: set(term()).
-
--define(UNUSED, []).
-
--ifdef(OTP_RELEASE). %% OTP21+ supports map iterators
-
--define(iterable(A), maps:iterator(A)).
-
--define(iterate(I, Last, K, Next, Cons),
-        case maps:next(I) of
-            none -> Last;
-            {K, _, Next} -> Cons
-        end).
-
--else.
-
--define(iterable(A), maps:keys(A)).
-
--define(iterate(I, Last, K, Next, Cons),
-        case I of
-            [] -> Last;
-            [K|Next] -> Cons
-        end).
-
--endif.
-
--spec new() -> set().
-new() ->
-    #{}.
-
--spec is_set(term()) -> boolean().
-is_set(A) ->
-    is_map(A).
-
--spec size(set()) -> non_neg_integer().
-size(A) ->
-    maps:size(A).
-
--spec fold(Function, Acc, Set) -> Acc when
-      Function :: fun((Element, Acc) -> Acc),
-      Set :: set(Element),
-      Acc :: term().
-fold(Fun, A, B) ->
-    maps:fold( fun(K, _, Acc) -> Fun(K, Acc) end
-             , A
-             , B).
-
--spec filter(Predicate, Set) -> Set when
-      Predicate :: fun((Element) -> boolean()),
-      Set :: set(Element).
-filter(P, A) ->
-    maps:filter( fun(K, _) -> P(K) end
-               , A).
-
--spec to_list(set(Elem)) -> [Elem].
-to_list(A) ->
-    maps:keys(A).
-
--spec from_list([Elem]) -> set(Elem).
-from_list(L) ->
-    maps:from_list([{I, ?UNUSED} || I <- L]).
-
--spec is_element(Elem, set(Elem)) -> boolean().
-is_element(Elem, Set) ->
-    maps:is_key(Elem, Set).
-
--spec add_element(Elem, set(Elem)) -> set(Elem).
-add_element(Elem, Set) ->
-    Set#{Elem => ?UNUSED}.
-
--spec del_element(Elem, set(Elem)) -> set(Elem).
-del_element(Elem, Set) ->
-    maps:remove(Elem, Set).
-
--spec is_subset(set(Elem), set(Elem)) -> boolean().
-is_subset(S1, S2) ->
-  is_subset_(?iterable(S1), S2).
-
-is_subset_(Iter, S2) ->
-    ?iterate(Iter,
-             true,
-             K, Next,
-             case maps:is_key(K, S2) of
-                 true ->
-                     is_subset_(Next, S2);
-                 false ->
-                     false
-             end).
-
--spec subtract(set(Elem), set(Elem)) -> set(Elem).
-subtract(S1, S2) ->
-    maps:without(maps:keys(S2), S1).
-
--spec union(set(Elem), set(Elem)) -> set(Elem).
-union(S1, S2) ->
-    maps:merge(S1, S2).
-
--spec union([set(Elem)]) -> set(Elem).
-union(L) ->
-    lists:foldl(fun maps:merge/2, #{}, L).
-
--spec intersection(set(Elem), set(Elem)) -> set(Elem).
-intersection(S1, S2) ->
-    case maps:size(S1) > maps:size(S2) of
-        true ->
-            intersection_(S1, S2);
-        false ->
-            intersection_(S2, S1)
-    end.
-intersection_(Large, Small) ->
-    maps:fold( fun(E, _, Acc) ->
-                       case maps:is_key(E, Large) of
-                           true ->
-                               Acc #{E => ?UNUSED};
-                           _ ->
-                               Acc
-                       end
-               end
-             , #{}
-             , Small).
-
--spec intersection(nonempty_list(set(Elem))) -> set(Elem).
-intersection([H|T]) ->
-    lists:foldl(fun intersection/2, H, T).
-
--spec is_disjoint(set(Elem), set(Elem)) -> boolean().
-is_disjoint(S1, S2) ->
-    case maps:size(S1) > maps:size(S2) of
-        true ->
-            is_disjoint_(S1, ?iterable(S2));
-        false ->
-            is_disjoint_(S2, ?iterable(S1))
-    end.
-is_disjoint_(Large, Small) ->
-    ?iterate(Small,
-             true,
-             K, Next,
-             case maps:is_key(K, Large) of
-                 true ->
-                     false;
-                 false ->
-                     is_disjoint_(Large, Next)
-             end).
diff --git a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/release.json b/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/release.json
deleted file mode 100644
index 569602669..000000000
--- a/apps/emqx_plugins/test/emqx_plugins_SUITE_data/emqx_plugin_template-5.0-rc.1/release.json
+++ /dev/null
@@ -1,28 +0,0 @@
-{
-    "authors": [
-        "EMQ X Team"
-    ],
-    "builder": {
-        "contact": "emqx-support@emqx.io",
-        "name": "EMQ X Team",
-        "website": "www.emqx.com"
-    },
-    "built_on_otp_release": "24",
-    "compatibility": {
-        "emqx": "~> 5.0"
-    },
-    "date": "2021-12-16",
-    "description": "This is a demo plugin",
-    "functionality": [
-        "Demo"
-    ],
-    "git_ref": "ddab50fafeed6b1faea70fc9ffd8c700d7e26ec1",
-    "metadata_vsn": "0.1.0",
-    "name": "emqx_plugin_template",
-    "rel_apps": [
-        "emqx_plugin_template-5.0.0",
-        "map_sets-1.1.0"
-    ],
-    "rel_vsn": "5.0-rc.1",
-    "repo": "https://github.com/emqx/emqx-plugin-template"
-}
\ No newline at end of file
diff --git a/apps/emqx_plugins/test/emqx_plugins_tests.erl b/apps/emqx_plugins/test/emqx_plugins_tests.erl
index b5c9f9da8..2b7fb9fe4 100644
--- a/apps/emqx_plugins/test/emqx_plugins_tests.erl
+++ b/apps/emqx_plugins/test/emqx_plugins_tests.erl
@@ -45,7 +45,7 @@ read_plugin_test() ->
             try
                 ok = write_file(InfoFile, FakeInfo),
                 ?assertMatch({error, #{error := "bad_rel_apps"}},
-                             emqx_plugins:read_plugin(NameVsn))
+                             emqx_plugins:read_plugin(NameVsn, #{}))
             after
                 emqx_plugins:purge(NameVsn)
             end
@@ -100,4 +100,3 @@ purge_test() ->
             ok = file:write_file(Dir, "a"),
             ?assertEqual(ok, emqx_plugins:purge("a-1"))
         end).
-