chore(audit): emit the message field

apps/emqx/include/logger.hrl

@@ -61,9 +61,7 @@
     )
 end).
 
--define(AUDIT(_Level_, _From_, _Meta_), ?AUDIT(_Level_, _From_, undefined, _Meta_)).
-
--define(AUDIT(_Level_, _From_, _Msg_, _Meta_), begin
+-define(AUDIT(_Level_, _From_, _Meta_), begin
     case emqx_config:get([log, audit], #{enable => false}) of
         #{enable := false} ->
             ok;
@@ -73,7 +71,7 @@ end).
                     emqx_trace:log(
                         _Level_,
                         [{emqx_audit, fun(L, _) -> L end, undefined, undefined}],
-                        {report, _Msg_},
+                        _Msg = undefined,
                         _Meta_#{from => _From_}
                     );
                 gt ->

apps/emqx/src/emqx_logger_jsonfmt.erl

@@ -93,6 +93,8 @@ format(Msg, Meta, Config) ->
         end,
     emqx_utils_json:encode(json_obj_root(Data, Config)).
 
+maybe_format_msg(undefined, _Meta, _Config) ->
+    #{};
 maybe_format_msg({report, Report} = Msg, #{report_cb := Cb} = Meta, Config) ->
     case is_map(Report) andalso Cb =:= ?DEFAULT_FORMATTER of
         true ->

apps/emqx_machine/src/emqx_machine_terminator.erl

@@ -67,8 +67,9 @@ graceful() ->
 
 %% @doc Shutdown the Erlang VM and wait indefinitely.
 graceful_wait() ->
-    ?AUDIT(alert, cli, run_emqx_stop_to_grace_shutdown, #{
-        time => logger:timestamp()
+    ?AUDIT(alert, cli, #{
+        time => logger:timestamp(),
+        event => emqx_gracefully_stop
     }),
     ok = graceful(),
     exit_loop().