Cherry-picks for 2.10.16 (#5462)

Includes:

- #5460
- #5457

server/events.go

@@ -632,6 +632,11 @@ func (s *Server) sendInternalAccountMsgWithReply(a *Account, subject, reply stri
 	s.mu.RLock()
 	if s.sys == nil || s.sys.sendq == nil {
 		s.mu.RUnlock()
+		if s.isShuttingDown() {
+			// Skip in case this was called at the end phase during shut down
+			// to avoid too many entries in the logs.
+			return nil
+		}
 		return ErrNoSysAccount
 	}
 	c := s.sys.client

server/stream.go

@@ -4870,6 +4870,10 @@ func (mset *stream) name() string {
 
 func (mset *stream) internalLoop() {
 	mset.mu.RLock()
+	setGoRoutineLabels(pprofLabels{
+		"account": mset.acc.Name,
+		"stream":  mset.cfg.Name,
+	})
 	s := mset.srv
 	c := s.createInternalJetStreamClient()
 	c.registerWithAccount(mset.acc)