fix: refresh logger handler when starting

apps/emqx/src/config/emqx_config_logger.erl

@@ -18,7 +18,7 @@
 -behaviour(emqx_config_handler).
 
 %% API
--export([add_handler/0, remove_handler/0]).
+-export([add_handler/0, remove_handler/0, refresh_config/0]).
 -export([post_config_update/5]).
 
 -define(LOG, [log]).
@@ -31,6 +31,16 @@ remove_handler() ->
     ok = emqx_config_handler:remove_handler(?LOG),
     ok.
 
+%% refresh logger config when booting, the override config may have changed after node start.
+%% Kernel's app env is confirmed before the node starts,
+%% but we only copy cluster-override.conf from other node after this node starts,
+%% so we need to refresh the logger config after this node starts.
+%% It will not affect the logger config when cluster-override.conf is unchanged.
+refresh_config() ->
+    Log = emqx:get_raw_config(?LOG),
+    {ok, _} = emqx:update_config(?LOG, Log),
+    ok.
+
 post_config_update(?LOG, _Req, _NewConf, _OldConf, AppEnvs) ->
     Kernel = proplists:get_value(kernel, AppEnvs),
     NewHandlers = proplists:get_value(logger, Kernel, []),

apps/emqx/src/emqx_config.erl

@@ -582,6 +582,7 @@ save_to_override_conf(RawConf, Opts) ->
 add_handlers() ->
     ok = emqx_config_logger:add_handler(),
     emqx_sys_mon:add_handler(),
+    emqx_config_logger:refresh_config(),
     ok.
 
 remove_handlers() ->