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# 13 Upgrade notes for 5.0.3

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#### Zabbix agent on IBM AIX

Zabbix agent for AIX has been enhanced with capability to monitor
physical CPU utilization. A `system.cpu.util[]` item key now has an
additional 4th parameter:

-   system.cpu.util\[<cpu>,<type>,<mode>,**<logical\_or\_physical>**\]

The <logical\_or\_physical> key parameter allows to specify
whether an item should report logical or physical CPU utilization
(supported values: `logical`, `physical`). This new functionality uses
AIX libperfstat function `perfstat_cpu_util()` which is available from
AIX 6.1 TL07 and AIX 7.1 TL01 (as far as we could find). If your AIX
system does not have these technology levels installed, please use an
older agent version. You can check which AIX version and technology
level (TL) is installed by running `oslevel` command (see description in
the [IBM
documentation](https://www.ibm.com/support/knowledgecenter/ssw_aix_71/o_commands/oslevel.html))

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