fix(metrics): use the same data source for RAM usage info

apps/emqx/src/emqx.appup.src

@@ -1,33 +1,5 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{"5.0.0",
-    [{load_module,emqx_quic_connection,brutal_purge,soft_purge,[]},
-     {load_module,emqx_config,brutal_purge,soft_purge,[]},
-     {load_module,emqx_channel,brutal_purge,soft_purge,[]},
-     {load_module,emqx_schema,brutal_purge,soft_purge,[]},
-     {load_module,emqx_release,brutal_purge,soft_purge,[]},
-     {load_module,emqx_authentication,brutal_purge,soft_purge,[]},
-     {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
-     {add_module,emqx_exclusive_subscription},
-     {apply,{emqx_exclusive_subscription,on_add_module,[]}},
-     {load_module,emqx_broker,brutal_purge,soft_purge,[]},
-     {load_module,emqx_mqtt_caps,brutal_purge,soft_purge,[]},
-     {load_module,emqx_topic,brutal_purge,soft_purge,[]},
-     {load_module,emqx_relup}]},
-   {<<".*">>,[]}],
-  [{"5.0.0",
-    [{load_module,emqx_quic_connection,brutal_purge,soft_purge,[]},
-     {load_module,emqx_config,brutal_purge,soft_purge,[]},
-     {load_module,emqx_channel,brutal_purge,soft_purge,[]},
-     {load_module,emqx_schema,brutal_purge,soft_purge,[]},
-     {load_module,emqx_release,brutal_purge,soft_purge,[]},
-     {load_module,emqx_authentication,brutal_purge,soft_purge,[]},
-     {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
-     {load_module,emqx_broker,brutal_purge,soft_purge,[]},
-     {load_module,emqx_mqtt_caps,brutal_purge,soft_purge,[]},
-     {load_module,emqx_topic,brutal_purge,soft_purge,[]},
-     {apply,{emqx_exclusive_subscription,on_delete_module,[]}},
-     {delete_module,emqx_exclusive_subscription},
-     {load_module,emqx_relup}]},
-   {<<".*">>,[]}]}.
+  [{<<".*">>,[]}],
+  [{<<".*">>,[]}]}.

apps/emqx/src/emqx_vm.erl

@@ -24,7 +24,6 @@
     get_system_info/1,
     get_memory/0,
     get_memory/2,
-    mem_info/0,
     loads/0
 ]).
 
@@ -226,12 +225,6 @@ convert_allocated_areas({Key, Value1, Value2}) ->
 convert_allocated_areas({Key, Value}) ->
     {Key, Value}.
 
-mem_info() ->
-    Dataset = memsup:get_system_memory_data(),
-    Total = proplists:get_value(total_memory, Dataset),
-    Free = proplists:get_value(free_memory, Dataset),
-    [{total_memory, Total}, {used_memory, Total - Free}].
-
 %%%% erlang vm scheduler_usage  fun copied from recon
 scheduler_usage(Interval) when is_integer(Interval) ->
     %% We start and stop the scheduler_wall_time system flag

apps/emqx/test/emqx_vm_SUITE.erl

@@ -50,12 +50,6 @@ t_systeminfo(_Config) ->
     ),
     ?assertEqual(undefined, emqx_vm:get_system_info(undefined)).
 
-t_mem_info(_Config) ->
-    application:ensure_all_started(os_mon),
-    MemInfo = emqx_vm:mem_info(),
-    [{total_memory, _}, {used_memory, _}] = MemInfo,
-    application:stop(os_mon).
-
 t_process_info(_Config) ->
     ProcessInfo = emqx_vm:get_process_info(),
     ?assertEqual(emqx_vm:process_info_keys(), [K || {K, _V} <- ProcessInfo]).

apps/emqx_management/src/emqx_mgmt.erl

@@ -104,7 +104,10 @@
 ]).
 
 %% Common Table API
--export([max_row_limit/0]).
+-export([
+    max_row_limit/0,
+    vm_stats/0
+]).
 
 -define(APP, emqx_management).
 
@@ -161,6 +164,23 @@ node_info(Nodes) ->
 stopped_node_info(Node) ->
     #{name => Node, node_status => 'stopped'}.
 
+vm_stats() ->
+    Idle =
+        case cpu_sup:util([detailed]) of
+            %% Not support for Windows
+            {_, 0, 0, _} -> 0;
+            {_Num, _Use, IdleList, _} -> proplists:get_value(idle, IdleList, 0)
+        end,
+    RunQueue = erlang:statistics(run_queue),
+    {MemUsedRatio, MemTotal} = get_sys_memory(),
+    [
+        {run_queue, RunQueue},
+        {cpu_idle, Idle},
+        {cpu_use, 100 - Idle},
+        {total_memory, MemTotal},
+        {used_memory, erlang:round(MemTotal * MemUsedRatio)}
+    ].
+
 %%--------------------------------------------------------------------
 %% Brokers
 %%--------------------------------------------------------------------

apps/emqx_prometheus/src/emqx_prometheus.app.src

@@ -2,7 +2,7 @@
 {application, emqx_prometheus, [
     {description, "Prometheus for EMQX"},
     % strict semver, bump manually!
-    {vsn, "5.0.5"},
+    {vsn, "5.0.6"},
     {modules, []},
     {registered, [emqx_prometheus_sup]},
     {applications, [kernel, stdlib, prometheus, emqx]},

apps/emqx_prometheus/src/emqx_prometheus.erl

@@ -590,20 +590,7 @@ emqx_vm() ->
     ].
 
 emqx_vm_data() ->
-    Idle =
-        case cpu_sup:util([detailed]) of
-            %% Not support for Windows
-            {_, 0, 0, _} -> 0;
-            {_Num, _Use, IdleList, _} -> ?C(idle, IdleList)
-        end,
-    RunQueue = erlang:statistics(run_queue),
-    [
-        {run_queue, RunQueue},
-        %% XXX: Plan removed at v5.0
-        {process_total_messages, 0},
-        {cpu_idle, Idle},
-        {cpu_use, 100 - Idle}
-    ] ++ emqx_vm:mem_info().
+    emqx_mgmt:vm_stats().
 
 emqx_cluster() ->
     [

apps/emqx_statsd/src/emqx_statsd.app.src

@@ -1,7 +1,7 @@
 %% -*- mode: erlang -*-
 {application, emqx_statsd, [
     {description, "EMQX Statsd"},
-    {vsn, "5.0.4"},
+    {vsn, "5.0.5"},
     {registered, []},
     {mod, {emqx_statsd_app, []}},
     {applications, [

apps/emqx_statsd/src/emqx_statsd.erl

@@ -105,7 +105,7 @@ handle_info(
         timer := Ref
     }
 ) ->
-    Metrics = emqx_metrics:all() ++ emqx_stats:getstats() ++ emqx_vm_data(),
+    Metrics = emqx_metrics:all() ++ emqx_stats:getstats() ++ emqx_mgmt:vm_stats(),
     SampleRate = SampleTimeInterval / FlushTimeInterval,
     StatsdMetrics = [
         {gauge, Name, Value, SampleRate, []}
@@ -129,20 +129,6 @@ terminate(_Reason, #{estatsd_pid := Pid}) ->
 %% Internal function
 %%------------------------------------------------------------------------------
 
-emqx_vm_data() ->
-    Idle =
-        case cpu_sup:util([detailed]) of
-            %% Not support for Windows
-            {_, 0, 0, _} -> 0;
-            {_Num, _Use, IdleList, _} -> proplists:get_value(idle, IdleList, 0)
-        end,
-    RunQueue = erlang:statistics(run_queue),
-    [
-        {run_queue, RunQueue},
-        {cpu_idle, Idle},
-        {cpu_use, 100 - Idle}
-    ] ++ emqx_vm:mem_info().
-
 ensure_timer(State = #{sample_time_interval := SampleTimeInterval}) ->
     State#{timer => emqx_misc:start_timer(SampleTimeInterval, ?SAMPLE_TIMEOUT)}.