Using an Alias will now work properly with active-only checks (log, logrt, eventlog).
When using system.cpu.discovery on Solaris agent will now return JSON with correct value of {#CPU.NUMBER} that is suitable for item prototype.
The default error message displayed for unsupported items has been changed from "Item is not supported." and "ZBX_NOTSUPPORTED" to "Unknown error.". This message is used when an item check fails without setting error message.
Input file description in the zabbix_sender manpage has been improved by adding rules and examples.
Zabbix now tries to differentiate item timeouts from host timeouts. If another item check was successful between two failed checks of a problematic item, then the problematic item is marked as not supported after the second failed check without affecting host availability.