fix: alway use os:system_time/1 when managing traces

apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl

@@ -36,6 +36,7 @@
         , delete/1
         , clear/0
         , update/2
+        , os_now/0
         ]).
 
 -export([ format/1
@@ -515,6 +516,6 @@ set_log_primary_level(NewLevel) ->
         false -> ok
     end.
 
-%% the dashboard use os time to create trace, donot use erlang:system_time/1
+%% the dashboard use os time to create trace, do not use erlang:system_time/1
 os_now() ->
     os:system_time(second).

apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl

@@ -44,7 +44,7 @@ list_trace(_, _Params) ->
             Nodes = ekka_mnesia:running_nodes(),
             TraceSize = cluster_call(?MODULE, get_trace_size, [], 30000),
             AllFileSize = lists:foldl(fun(F, Acc) -> maps:merge(Acc, F) end, #{}, TraceSize),
-            Now = erlang:system_time(second),
+            Now = emqx_trace:os_now(),
             Traces =
                 lists:map(fun(Trace = #{name := Name, start_at := Start,
                     end_at := End, enable := Enable, type := Type, filter := Filter}) ->