fix: move group push work off topic loop

server/session.go

@@ -904,6 +904,7 @@ func (s *Session) publish(msg *ClientComMessage) {
 
 	if sub := s.getSub(msg.RcptTo); sub != nil {
 		// This is a post to a subscribed topic. The message is sent to the topic only
+		msg.queuedAt = time.Now()
 		select {
 		case sub.broadcast <- msg:
 			immetrics.ObserveInternalQueueEnqueue("session_topic_publish", len(sub.broadcast), cap(sub.broadcast), true)
@@ -1722,6 +1723,7 @@ func (s *Session) note(msg *ClientComMessage) {
 
 	if sub := s.getSub(msg.RcptTo); sub != nil {
 		// Pings can be sent to subscribed topics only
+		msg.queuedAt = time.Now()
 		select {
 		case sub.broadcast <- msg:
 		default: