chore: make dialyzer happy

apps/emqx_prometheus/src/emqx_prometheus_config.erl

@@ -1,11 +1,18 @@
-%%%-------------------------------------------------------------------
-%%% @author zhongwen
-%%% @copyright (C) 2022, <COMPANY>
-%%% @doc
-%%%
-%%% @end
-%%% Created : 26. 10月 2022 11:14
-%%%-------------------------------------------------------------------
+%%--------------------------------------------------------------------
+%% Copyright (c) 2020-2022 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_prometheus_config).
 
 -behaviour(emqx_config_handler).
@@ -40,8 +47,7 @@ remove_handler() ->
 
 post_config_update(?PROMETHEUS, _Req, New, _Old, AppEnvs) ->
     application:set_env(AppEnvs),
-    update_prometheus(New),
-    ok;
+    update_prometheus(New);
 post_config_update(_ConfPath, _Req, _NewConf, _OldConf, _AppEnvs) ->
     ok.
 

apps/emqx_prometheus/src/emqx_prometheus_sup.erl

@@ -68,4 +68,4 @@ init([]) ->
 assert_started({ok, _Pid}) -> ok;
 assert_started({ok, _Pid, _Info}) -> ok;
 assert_started({error, {already_started, _Pid}}) -> ok;
-assert_started({error, Reason}) -> erlang:error(Reason).
+assert_started({error, Reason}) -> {error, Reason}.