Steps to reproduce:

I upgraded our Zabbix from 5.2 to 6.2.2. Everything seems fine, except we have a handful of hosts monitored by Zabbix Proxy, and there are some items in queue that never get processed in the queue related to "Disk read request avg waiting time (r_await)" and "Disk read request avg waiting time (w_await)"

I don't really know if it is caused by upgrade or not, as I don't see any historical data for those items for the hosts monitored by proxy. Hosts NOT monitored by proxy are fine. So, perhaps this check just never worked via proxy for some reason?

I've also gone through the process here to clear the proxy queue -> https://blog.zabbix.com/how-to-troubleshoot-zabbix-proxy-high-queue/12244/#:~:text=not%20keeping%20up.-,Too%20many%20unsent%20values,-Sometimes%2C%20any%20of

Result:

Expected:
This is a working host, NOT monitored by proxy - all using same template (linux by agent):