feat(api): field shared_subscriptions in endpoint /monitor_current

apps/emqx_dashboard/include/emqx_dashboard.hrl

@@ -85,3 +85,17 @@
     sent => sent_msg_rate,
     dropped => dropped_msg_rate
 }).
+
+-define(CURRENT_SAMPLE_NON_RATE,
+    [
+        node_uptime,
+        retained_msg_count,
+        shared_subscriptions
+    ] ++ ?LICENSE_QUOTA
+).
+
+-if(?EMQX_RELEASE_EDITION == ee).
+-define(LICENSE_QUOTA, [license_quota]).
+-else.
+-define(LICENSE_QUOTA, []).
+-endif.

apps/emqx_dashboard/src/emqx_dashboard_monitor.erl

@@ -357,8 +357,8 @@ next_interval() ->
 
 sample(Time) ->
     Fun =
-        fun(Key, Res) ->
-            maps:put(Key, getstats(Key), Res)
+        fun(Key, Acc) ->
+            Acc#{Key => getstats(Key)}
         end,
     Data = lists:foldl(Fun, #{}, ?SAMPLER_LIST),
     #emqx_monit{time = Time, data = Data}.
@@ -416,6 +416,8 @@ stats(live_connections) -> emqx_stats:getstat('live_connections.count');
 stats(cluster_sessions) -> emqx_stats:getstat('cluster_sessions.count');
 stats(topics) -> emqx_stats:getstat('topics.count');
 stats(subscriptions) -> emqx_stats:getstat('subscriptions.count');
+stats(shared_subscriptions) -> emqx_stats:getstat('subscriptions.shared.count');
+stats(retained_msg_count) -> emqx_stats:getstat('retained.count');
 stats(received) -> emqx_metrics:val('messages.received');
 stats(received_bytes) -> emqx_metrics:val('bytes.received');
 stats(sent) -> emqx_metrics:val('messages.sent');
@@ -428,7 +430,8 @@ stats(dropped) -> emqx_metrics:val('messages.dropped').
 %% the non rate values should be same on all nodes
 non_rate_value() ->
     (license_quota())#{
-        retained_msg_count => emqx_retainer:retained_count(),
+        retained_msg_count => stats(retained_msg_count),
+        shared_subscriptions => stats(shared_subscriptions),
         node_uptime => emqx_sys:uptime()
     }.
 

apps/emqx_dashboard/src/emqx_dashboard_monitor_api.erl

@@ -94,7 +94,7 @@ schema("/monitor_current/nodes/:node") ->
             description => ?DESC(current_stats_node),
             parameters => [parameter_node()],
             responses => #{
-                200 => hoconsc:mk(hoconsc:ref(sampler_current), #{}),
+                200 => hoconsc:mk(hoconsc:ref(sampler_current_node), #{}),
                 404 => emqx_dashboard_swagger:error_codes(['NOT_FOUND'], <<"Node not found">>)
             }
         }
@@ -125,8 +125,17 @@ fields(sampler) ->
          || SamplerName <- ?SAMPLER_LIST
         ],
     [{time_stamp, hoconsc:mk(non_neg_integer(), #{desc => <<"Timestamp">>})} | Samplers];
+fields(sampler_current_node) ->
+    fields_current(sample_names(sampler_current_node));
 fields(sampler_current) ->
-    Names = maps:values(?DELTA_SAMPLER_RATE_MAP) ++ ?GAUGE_SAMPLER_LIST,
+    fields_current(sample_names(sampler_current)).
+
+sample_names(sampler_current_node) ->
+    maps:values(?DELTA_SAMPLER_RATE_MAP) ++ ?GAUGE_SAMPLER_LIST ++ ?CURRENT_SAMPLE_NON_RATE;
+sample_names(sampler_current) ->
+    sample_names(sampler_current_node) -- [node_uptime].
+
+fields_current(Names) ->
     [
         {SamplerName, hoconsc:mk(integer(), #{desc => swagger_desc(SamplerName)})}
      || SamplerName <- Names
@@ -167,6 +176,8 @@ current_rate(Node) ->
 %% -------------------------------------------------------------------------------------------------
 %% Internal
 
+-define(APPROXIMATE_DESC, " Can only represent an approximate state.").
+
 swagger_desc(received) ->
     swagger_desc_format("Received messages ");
 swagger_desc(received_bytes) ->
@@ -178,30 +189,18 @@ swagger_desc(sent_bytes) ->
 swagger_desc(dropped) ->
     swagger_desc_format("Dropped messages ");
 swagger_desc(subscriptions) ->
-    <<
-        "Subscriptions at the time of sampling."
-        " Can only represent the approximate state"
-    >>;
+    <<"Subscriptions at the time of sampling.", ?APPROXIMATE_DESC>>;
 swagger_desc(topics) ->
-    <<
-        "Count topics at the time of sampling."
-        " Can only represent the approximate state"
-    >>;
+    <<"Count topics at the time of sampling.", ?APPROXIMATE_DESC>>;
 swagger_desc(connections) ->
-    <<
-        "Sessions at the time of sampling."
-        " Can only represent the approximate state"
-    >>;
+    <<"Sessions at the time of sampling.", ?APPROXIMATE_DESC>>;
 swagger_desc(live_connections) ->
-    <<
-        "Connections at the time of sampling."
-        " Can only represent the approximate state"
-    >>;
+    <<"Connections at the time of sampling.", ?APPROXIMATE_DESC>>;
 swagger_desc(cluster_sessions) ->
     <<
         "Total number of sessions in the cluster at the time of sampling. "
-        "It includes expired sessions when `broker.session_history_retain` is set to a duration greater than `0s`. "
-        "Can only represent the approximate state"
+        "It includes expired sessions when `broker.session_history_retain` is set to a duration greater than `0s`."
+        ?APPROXIMATE_DESC
     >>;
 swagger_desc(received_msg_rate) ->
     swagger_desc_format("Dropped messages ", per);
@@ -210,7 +209,15 @@ swagger_desc(sent_msg_rate) ->
     swagger_desc_format("Sent messages ", per);
 %swagger_desc(sent_bytes_rate)     -> swagger_desc_format("Sent bytes ", per);
 swagger_desc(dropped_msg_rate) ->
-    swagger_desc_format("Dropped messages ", per).
+    swagger_desc_format("Dropped messages ", per);
+swagger_desc(retained_msg_count) ->
+    <<"Retained messages count at the time of sampling.", ?APPROXIMATE_DESC>>;
+swagger_desc(shared_subscriptions) ->
+    <<"Shared subscriptions count at the time of sampling.", ?APPROXIMATE_DESC>>;
+swagger_desc(node_uptime) ->
+    <<"Node up time in seconds. Only presented in endpoint: `/monitor_current/nodes/:node`.">>;
+swagger_desc(license_quota) ->
+    <<"License quota. AKA: limited max_connections for cluster">>.
 
 swagger_desc_format(Format) ->
     swagger_desc_format(Format, last).

changes/ce/feat-12670.en.md

@@ -0,0 +1 @@
+Add field `shared_subscriptions` to endpoint `/monitor_current` and `/monitor_current/nodes/:node`.