Steps to reproduce:

1. Default configuration
2. Deploy one Proxy with client agents
3. Deploy one Proxy with no client agents.
4. Stop services on Proxy with client agents and wait.
5. Watch Problems and you will see that all Proxies will start showing "More that 100 items have missing data for more that 10 minutes"
6. Check Administration -> Queue -> Overview by proxy and only 1 proxy has a queue.

Result:


Expected:
I would expect to only see the proxy with the missing items actually trigger and the Zabbix Server.