docker部署的seafile 12，按照官方的教程增加了notification通知服务，启动容器后查看seafile的日志发现，有一条报错信息似乎与notification有关，但是并不影响使用，请教这个信息是什么意思，如何能解决？日志如下：
*** Shutting down /scripts/enterpoint.sh (PID 22)…
*** Shutting down runit daemon (PID 21)…
*** Running /etc/my_init.post_shutdown.d/10_syslog-ng.shutdown…
*** Init system aborted.
*** Killing all processes…
*** Running /etc/my_init.d/01_create_data_links.sh…
*** Booting runit daemon…
*** Runit started as PID 21
*** Running /scripts/enterpoint.sh…
2025-06-17 15:17:28 Nginx ready
nginx: [emerg] host not found in upstream “notification” in /etc/nginx/sites-enabled/seafile.nginx.conf:75
2025-06-17 15:17:28 This is an idle script (infinite loop) to keep container running.
nginx: [emerg] host not found in upstream “notification” in /etc/nginx/sites-enabled/seafile.nginx.conf:75
[2025-06-17 15:17:28] Skip running setup-seafile-mysql.py because there is existing seafile-data folder.
Starting seafile server, please wait …
Seafile server started
Done.
Starting seahub at port 8000 …
Seahub is started
Done.