I've been able to successfully install and manage a zabbix monitor system v1.8.2 across a couple
of our servers now and found your product to be almost the next best thing since sliced bread.
( I'm even trying to convince mgmt to contribute $, towards your open source cause. )

As I was digging through the documentation, doing trial-n-error on the configuration, and while
creating new 'items' it became evident to me that there are missing details in the documentation.

1) Could you please document the relationship between the "key", and the "expression" fields, for items of type 'calculated'.
THE CURRENT DOC: Section 4 Configuration, Sub-Section 19-12 Calculated Items: only briefly mentions "You can create any key name using supported symbols. "
Can these custom keys follow the same format as others? ex: user.mem[<name>]
The only 'calculated' keys I've been able to create are "user_mem_NameOfUser".
How to pass variables between the key and expression?

2) Could you please document the difference between
the item types 'zabbix agent' and 'zabbix agent (active)'?

3) Could you please document that the 'SSH' check will trigger errors into the system /var/adm/message because it does not construct a valid SSH client before disconnecting. (Side Note: The 60 sec cycle of SSH checks eventually caused our inetd to crash )

4) There is an 'scripts' feature under administration tab where custom commands can be entered.
Please document how to execute these scripts. Ex: is there an association to an 'item' or 'host'?

Sincerely,
J Jorgenson.