I found one issue with proxy.

When I run Zabbix proxy with Galera cluster, the queue will have a lot of items more than 10 minutes,

The only way to fix this issue is like below steps:

1.Stop all other two galera nodes.

2. truncate table proxy_history; truncate table ids;

3.Restart Zabbix server

I'm pretty sure this environment will cause issue, but why?

The system I/O is not high ... What is the root cause?