1 Creating an item

Overview

To create an item in Zabbix frontend, do the following:

• Go to: Configuration → Hosts
• Click on Items in the row of the host
• Click on Create item in the upper right corner of the screen
• Enter parameters of the item in the form

Configuration

Item attributes:

Parameter	Description
Name	This is how the item will be named. The following macros can be used: $1, $2...$9 - referring to the first, second... ninth parameter of the item key For example: Free disk space on $1 If the item key is "vfs.fs.size[/,free]", the description will automatically change to "Free disk space on /"
Type	Item type. See individual item type sections.
Key	Item key (up to 256 characters). The supported item keys can be found in individual item type sections. The key must be unique within a single host. If key type is 'Zabbix agent', 'Zabbix agent (active)', 'Simple check' or 'Zabbix aggregate', the key value must be supported by Zabbix agent or Zabbix server. See also: the correct key format.
Host interface	Select the host interface. This field is available when editing an item on the host level.
Type of information	Type of data as stored in the database after performing conversions, if any. Numeric (unsigned) - 64bit unsigned integer Numeric (float) - floating point number Negative values can be stored. Allowed range: -999999999999.9999 to 999999999999.9999. Starting with Zabbix 2.2, receiving values in scientific notation is also supported. E.g. 1e+7, 1e-4. Character - short text data Log - long text data with optional log related properties (timestamp, source, severity, logeventid) Text - long text data Limits of text data are described in the table below.
Data type	Data type is used for integer items in order to specify the expected data type: Boolean - textual representation translated into either 0 or 1. Thus, 'TRUE' is stored as 1 and 'FALSE' is stored as 0. All values are matched in a case-insensitive way. Currently recognized values are, for: TRUE - true, t, yes, y, on, up, running, enabled, available FALSE - false, f, no, n, off, down, unused, disabled, unavailable Additionally, any non-zero numeric value is considered to be TRUE and zero is considered to be FALSE. Octal - data in octal format Decimal - data in decimal format Hexadecimal - data in hexadecimal format Zabbix will automatically perform the conversion to numeric. The conversion is done by Zabbix server (even when a host is monitored by Zabbix proxy).
Units	If a unit symbol is set, Zabbix will add post processing to the received value and display it with the set unit postfix. By default, if the raw value exceeds 1000, it is divided by 1000 and displayed accordingly. For example, if you set bps and receive a value of 881764, it will be displayed as 881.76 Kbps. The JEDEC memory standard is used for processing B (byte), Bps (bytes per second) units, which are divided by 1024. Thus, if units are set to B or Bps Zabbix will display: 1 as 1B/1Bps 1024 as 1KB/1KBps 1536 as 1.5KB/1.5KBps Special processing is used if the following time-related units are used: unixtime - translated to "yyyy.mm.dd hh:mm:ss". To translate correctly, the received value must be a Numeric (unsigned) type of information. uptime - translated to "hh:mm:ss" or "N days, hh:mm:ss" For example, if you receive the value as 881764 (seconds), it will be displayed as "10 days, 04:56:04" s - translated to "yyy mmm ddd hhh mmm sss ms"; parameter is treated as number of seconds. For example, if you receive the value as 881764 (seconds), it will be displayed as "10d 4h 56m" Only 3 upper major units are shown, like "1m 15d 5h" or "2h 4m 46s". If there are no days to display, only two levels are displayed - "1m 5h" (no minutes, seconds or milliseconds are shown). Will be translated to "< 1 ms" if the value is less than 0.001. See also the unit blacklist.
Use custom multiplier	If you enable this option, all received values will be multiplied by the integer or floating-point value set in the value field. Use this option to convert values received in KB, MBps, etc into B, Bps. Otherwise Zabbix cannot correctly set prefixes (K, M, G etc). Note that if the item type of information is Numeric (unsigned), incoming values with a fractional part will be trimmed (i.e. '0.9' will become '0') before the custom multiplier is applied. Starting with Zabbix 2.2, using scientific notation is also supported. E.g. 1e+70.
Update interval (in sec)	Retrieve a new value for this item every N seconds. Maximum allowed update interval is 86400 seconds (1 day). Note: The update interval can only be set to '0' if custom intervals exist with a non-zero value. If set to '0', and a custom interval (flexible or scheduled) exists with a non-zero value, the item will be polled during the custom interval duration. Note that the first item poll after the item became active or after update interval change might occur earlier than the configured value.
Custom intervals	You can create custom rules for checking the item: Flexible - create an exception to the Update interval (interval with different frequency) Scheduling - create a custom polling schedule. For detailed information see Custom intervals. Scheduling is supported since Zabbix 3.0.0. Note: Not available for Zabbix agent active items.
History storage period (in days)	Number of days to keep detailed history in the database. Older data will be removed by the housekeeper. Starting with Zabbix 2.2, this value can be overridden globally in Administration → General → Housekeeper. If the global setting exists, a warning message is displayed: It is recommended to keep the recorded values for the smallest possible number of days to reduce the size of value history in the database. Instead of keeping long history of values, you can keep longer data of trends. If set to "0" no data is stored in the history table for the item. Host inventory data only are updated. See also History and trends.
Trend storage period (in days)	Keep aggregated (hourly min, max, avg, count) detailed history for N days in the database. Older data will be removed by the housekeeper. Starting with Zabbix 2.2, this value can be overridden globally in Administration → General → Housekeeper. If the global setting exists, a warning message is displayed: Note: Keeping trends is not available for non-numeric data - character, log and text. If set to "0" no trends are kept. See also History and trends.
Store value	As is - no pre-processing Delta (speed per second) - evaluate value as (value-prev_value)/(time-prev_time), where value - current value value_prev - previously received value time - current timestamp prev_time - timestamp of previous value This setting is extremely useful to get speed per second for a constantly growing value. If current value is smaller than the previous value, Zabbix discards that difference (stores nothing) and waits for another value. This helps to work correctly with, for instance, a wrapping (overflow) of 32-bit SNMP counters. Note: As this calculation may produce floating point numbers, it is recommended to set the 'Type of information' to Numeric (float), even if the incoming raw values are integers. This is especially relevant for small numbers where the decimal part matters. If the floating point values are large and may exceed the 'float' field length in which case the entire value may be lost, it is actually suggested to use Numeric (unsigned) and thus trim only the decimal part. Delta (simple change) - evaluate as (value-prev_value), where value - current value value_prev - previously received value This setting can be useful to measure a constantly growing value. If the current value is smaller than the previous value, Zabbix discards that difference (stores nothing) and waits for another value.
Show value	Apply value mapping to this item. Value mapping does not change received values, it is for displaying data only. It works with Numeric(unsigned), Numeric(float) and Character items. For example, "Windows service states".
Log time format	Available for items of type Log only. Supported placeholders: * y: Year (1970-2038) * M: Month (01-12) * d: Day (01-31) * h: Hour (00-23) * m: Minute (00-59) * s: Second (00-59) If left blank the timestamp will not be parsed. For example, consider the following line from the Zabbix agent log file: " 23480:20100328:154718.045 Zabbix agent started. Zabbix 1.8.2 (revision 11211)." It begins with six character positions for PID, followed by date, time, and the rest of the line. Log time format for this line would be "pppppp:yyyyMMdd:hhmmss". Note that "p" and ":" chars are just placeholders and can be anything but "yMdhms".
New application	Enter the name of a new application for the item.
Applications	Link item to one or more existing applications.
Populates host inventory field	You can select a host inventory field that the value of item will populate. This will work if automatic inventory population is enabled for the host. This field is not available if Type of information is set to 'Log'.
Description	Enter an item description.
Enabled	Mark the checkbox to enable the item so it will be processed.

You can also create an item by opening an existing one, pressing the Clone button and then saving under a different name.

Text data limits

Text data limits depend on the database backend. Before storing text values in the database they get truncated to match the database value type limit:

Unit blacklist

By default, specifying a unit for an item will result in a multiplier prefix being added - for example, value 2048 with unit B would be displayed as 2KB. For a pre-defined, hardcoded list of units this is prevented:

• ms
• RPM
• rpm
• %

Note that both lowercase and uppercase rpm (rpm and RPM) strings are blacklisted.

Unsupported items

An item can become unsupported if its value cannot be retrieved for some reason. Such items are still rechecked at a fixed interval, configurable in Administration section.

Unsupported items are reported as having a NOT SUPPORTED state.