Merge pull request #9930 from olcai/add-live-connections-to-prometheus-v5

feat(emqx_prometheus): expose live_connections stats to prometheus

apps/emqx_prometheus/src/emqx_prometheus.app.src

@@ -2,7 +2,7 @@
 {application, emqx_prometheus, [
     {description, "Prometheus for EMQX"},
     % strict semver, bump manually!
-    {vsn, "5.0.4"},
+    {vsn, "5.0.5"},
     {modules, []},
     {registered, [emqx_prometheus_sup]},
     {applications, [kernel, stdlib, prometheus, emqx]},

apps/emqx_prometheus/src/emqx_prometheus.erl

@@ -219,6 +219,10 @@ emqx_collect(emqx_connections_count, Stats) ->
     gauge_metric(?C('connections.count', Stats));
 emqx_collect(emqx_connections_max, Stats) ->
     gauge_metric(?C('connections.max', Stats));
+emqx_collect(emqx_live_connections_count, Stats) ->
+    gauge_metric(?C('live_connections.count', Stats));
+emqx_collect(emqx_live_connections_max, Stats) ->
+    gauge_metric(?C('live_connections.max', Stats));
 %% sessions
 emqx_collect(emqx_sessions_count, Stats) ->
     gauge_metric(?C('sessions.count', Stats));
@@ -460,6 +464,8 @@ emqx_stats() ->
     [
         emqx_connections_count,
         emqx_connections_max,
+        emqx_live_connections_count,
+        emqx_live_connections_max,
         emqx_sessions_count,
         emqx_sessions_max,
         emqx_topics_count,

changes/v5.0.17/feat-9930.en.md

@@ -0,0 +1 @@
+Expose the stats `live_connections.count` and `live_connections.max` to Prometheus.

changes/v5.0.17/feat-9930.zh.md

@@ -0,0 +1 @@
+将统计数据 `live_connections.count` 和 `live_connections.max` 公开给 Prometheus.