Strict validation of SNMP responses has been turned off for single-variable SNMP requests. Items on misbehaving devices will now be monitored normally, but messages about such responses will be logged at DebugLevel=4.
If an IPMI device reports a threshold sensor and a discrete sensor under the same name, the threshold sensor is now preferred. This might fix strange readings (like "1" for fan RPM) or "not supported" errors.
History related macros - {ITEM.VALUE}, {ITEM.LASTVALUE} and the {host:key.last()} functional macro - now obey the ZBX_HISTORY_PERIOD constant. This limits the amount of data the macro has to sift through and results in better performance.