History cache has been optimized to better handle a situation when it's being flooded with hundreds of thousands of values from less than a thousand items.
SNMP polling logic has been improved to always retry at least once. This should make Zabbix more resilient to network errors.
SNMP values of type OID are now supported.
Validation of received SNMP responses has been added to server and proxy. Now, upon receiving a malformed SNMP response server and proxy will log lines similar to the following:
SNMP response from host "gateway" does not contain all of the requested variable bindings While they do not cover all the problematic cases, they are a useful indicator that bulk SNMP requests should be turned off for this device.