feat(resman): also move out metrics collection for debugging

Now `emqx_resource:list_instances_verbose/0` will populate the metrics
for each instance, for the sake of simplicity.

apps/emqx_resource/include/emqx_resource.hrl

@@ -43,8 +43,7 @@
     config := resource_config(),
     error := term(),
     state := resource_state(),
-    status := resource_status(),
+    status := resource_status()
-    metrics => emqx_metrics_worker:metrics()
 }.
 -type resource_group() :: binary().
 -type creation_opts() :: #{

apps/emqx_resource/src/emqx_resource.erl

@@ -327,9 +327,12 @@ fetch_creation_opts(Opts) ->
 list_instances() ->
     [Id || #{id := Id} <- list_instances_verbose()].
 
--spec list_instances_verbose() -> [resource_data()].
+-spec list_instances_verbose() -> [_ResourceDataWithMetrics :: map()].
 list_instances_verbose() ->
-    emqx_resource_manager:list_all().
+    [
+        Res#{metrics => get_metrics(ResId)}
+     || #{id := ResId} = Res <- emqx_resource_manager:list_all()
+    ].
 
 -spec list_instances_by_type(module()) -> [resource_id()].
 list_instances_by_type(ResourceType) ->

apps/emqx_resource/src/emqx_resource_manager.erl

@@ -258,7 +258,7 @@ reset_metrics(ResId) ->
 list_all() ->
     try
         [
-            data_record_to_external_map_with_metrics(Data)
+            data_record_to_external_map(Data)
          || {_Id, _Group, Data} <- ets:tab2list(?ETS_TABLE)
         ]
     catch
@@ -669,11 +669,6 @@ data_record_to_external_map(Data) ->
         state => Data#data.state
     }.
 
--spec data_record_to_external_map_with_metrics(data()) -> resource_data().
-data_record_to_external_map_with_metrics(Data) ->
-    DataMap = data_record_to_external_map(Data),
-    DataMap#{metrics => get_metrics(Data#data.id)}.
-
 -spec wait_for_ready(resource_id(), integer()) -> ok | timeout | {error, term()}.
 wait_for_ready(ResId, WaitTime) ->
     do_wait_for_ready(ResId, WaitTime div ?WAIT_FOR_RESOURCE_DELAY).