Zabbix agent config changes
---------------------------------------

1. 1. 1. 1. Privileged file cksum
            UserParameter=sudo.cksum[*],sudo /usr/bin/cksum $1 | awk ' {print $ 1}

            '

Changes to /etc/sudoers
-------------------------------

1. Allow zabbix cksum of privileged files
   zabbix ALL=(ALL) NOPASSWD:/usr/bin/cksum

Items created in Zabbix Server
-----------------------------------------
Template_Linux_Essential:Checksum of /root/.ssh/authorized_keys
sudo.cksum[/root/.ssh/authorized_keys]
Zabbix agent (active)

Template_Linux_Essential:Checksum of /etc/sudoers
sudo.cksum[/etc/sudoers]
Zabbix agent (active)

--------------------------
When these items are created in the template but don't exist in the Zabbix agent config, the status of the items is automatically changed to "Not supported"

On some of our servers, this file "/root/.ssh/authorized_keys" does not exist. When the item status is changed for one of these hosts to "Active" in the Zabbix Admin, the next time the agent runs it crashes the server.

Additionally, the crash may occur when the agent is enabled with the item config, but the item is still marked as "Not supported" on the server.

Definitely the zabbix_server process is having trouble when this item fails, and maybe also changing an item from Not supported to active.