perf(group): reduce websocket fanout serialization

server/monitoring_http_test.go

@@ -98,6 +98,13 @@ func TestServeMetricsIncludesWSConnections(t *testing.T) {
 	immetrics.ObserveWSSendQueueDequeue(time.Now(), false)
 	immetrics.ObserveCtrlACKDelivery("write", time.Now())
 	immetrics.ObserveTopicQueueWait("group", time.Now())
+	immetrics.ObserveTopicProcess("group", "master", "publish", time.Now())
+	immetrics.ObserveTopicBroadcast("group", "master", time.Now(), 1, 0, 0)
+	immetrics.IncTopicSharedSerialization("group", "serialized")
+	immetrics.ObserveClusterM2PEnqueue("peer", 1)
+	immetrics.ObserveClusterM2PDequeue("peer", time.Now())
+	immetrics.ObserveClusterProxyQueueWait("data", time.Now())
+	immetrics.ObserveWSReadDispatch(time.Now())
 	immetrics.ObservePushDispatchEnqueue(1, true)
 	immetrics.ObservePushDispatch(time.Now(), 1, time.Now(), nil)
 	wrt := httptest.NewRecorder()
@@ -117,7 +124,11 @@ func TestServeMetricsIncludesWSConnections(t *testing.T) {
 		"im_ctrl_ack_delivery_duration_seconds",
 		"im_cluster_p2m_enqueue_total", "im_cluster_rpc_duration_seconds", "im_cluster_route_total",
 		"im_internal_queue_enqueue_total", "im_internal_queue_depth", "im_internal_queue_capacity", "im_internal_queue_current",
-		"im_topic_queue_wait_duration_seconds", "im_push_dispatch_queue_enqueue_total",
+		"im_topic_queue_wait_duration_seconds", "im_topic_process_duration_seconds",
+		"im_topic_broadcast_duration_seconds", "im_topic_broadcast_targets", "im_topic_shared_serialization_total",
+		"im_cluster_m2p_queue_wait_duration_seconds", "im_cluster_m2p_queue_depth",
+		"im_cluster_proxy_queue_wait_duration_seconds", "im_ws_read_dispatch_duration_seconds",
+		"im_push_dispatch_queue_enqueue_total",
 		"im_push_dispatch_queue_depth", "im_push_dispatch_queue_wait_duration_seconds",
 		"im_push_dispatch_duration_seconds", "im_push_recipient_count",
 		"im_kafka_message_persist_total", "im_kafka_consumer_lag", "im_kafka_dead_letters_total"} {