diff --git a/apps/emqx_connector/test/emqx_connector_api_SUITE.erl b/apps/emqx_connector/test/emqx_connector_api_SUITE.erl
index 12a3a8e23..4ecc61cec 100644
--- a/apps/emqx_connector/test/emqx_connector_api_SUITE.erl
+++ b/apps/emqx_connector/test/emqx_connector_api_SUITE.erl
@@ -221,6 +221,7 @@ t_mqtt_conn_bridge_ingress(_) ->
 
     %% ... and a MQTT bridge, using POST
     %% we bind this bridge to the connector created just now
+    timer:sleep(50),
     {ok, 201, Bridge} = request(post, uri(["bridges"]),
         ?MQTT_BRIDGE_INGRESS(ConnctorID)#{
             <<"type">> => ?CONNECTR_TYPE,
diff --git a/apps/emqx_prometheus/src/emqx_prometheus_api.erl b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
index 9e8904a4e..dda8bbd13 100644
--- a/apps/emqx_prometheus/src/emqx_prometheus_api.erl
+++ b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
@@ -67,16 +67,22 @@ prometheus(get, _Params) ->
     {200, emqx:get_raw_config([<<"prometheus">>], #{})};
 
 prometheus(put, #{body := Body}) ->
-    {ok, Config} = emqx:update_config([prometheus], Body),
-    case maps:get(<<"enable">>, Body) of
-        true ->
-            _ = emqx_prometheus_sup:stop_child(?APP),
-            emqx_prometheus_sup:start_child(?APP, maps:get(config, Config));
-        false ->
-            _ = emqx_prometheus_sup:stop_child(?APP),
-            ok
-        end,
-    {200, emqx:get_raw_config([<<"prometheus">>], #{})}.
+    case emqx:update_config([prometheus],
+                            Body,
+                            #{rawconf_with_defaults => true, override_to => cluster}) of
+        {ok, #{raw_config := NewConfig, config := Config}} ->
+            case maps:get(<<"enable">>, Body, true) of
+                true ->
+                    ok = emqx_prometheus_sup:stop_child(?APP),
+                    ok = emqx_prometheus_sup:start_child(?APP, Config);
+                false ->
+                    ok = emqx_prometheus_sup:stop_child(?APP)
+            end,
+            {200, NewConfig};
+        {error, Reason} ->
+            Message = list_to_binary(io_lib:format("Update config failed ~p", [Reason])),
+            {500, 'INTERNAL_ERROR', Message}
+    end.
 
 stats(get, #{headers := Headers}) ->
     Type =
diff --git a/apps/emqx_statsd/src/emqx_statsd_api.erl b/apps/emqx_statsd/src/emqx_statsd_api.erl
index ab9416266..c7ac94003 100644
--- a/apps/emqx_statsd/src/emqx_statsd_api.erl
+++ b/apps/emqx_statsd/src/emqx_statsd_api.erl
@@ -61,10 +61,8 @@ statsd(put, #{body := Body}) ->
         {ok, #{raw_config := NewConfig, config := Config}} ->
             ok = emqx_statsd_sup:ensure_child_stopped(?APP),
             case maps:get(<<"enable">>, Body) of
-                true ->
-                    ok = emqx_statsd_sup:ensure_child_started(?APP, maps:get(config, Config));
-                false ->
-                    ok
+                true -> emqx_statsd_sup:ensure_child_started(?APP, Config);
+                false -> ok
             end,
             {200, NewConfig};
         {error, Reason} ->