Steps to reproduce:
- Update the zabbix-server from a lower major version to higher one
- Update proxy(s)
- Check the data for the items monitored by server or proxy
New values collection is hanged. No overloaded processes, no high queue, and no resources lack.
Configuration cache reload -> no effect. Execute now several times -> no effect.
Item - re-creation -> all fine. Server/proxy restart + Execute Now for the affected items -> all fine
No hangs for data collection after the upgrade