Variable Triggers
Every variable trigger periodically inspects value the variable in every context matching the mask defined by the Context Mask setting. Polling period is defined in seconds, by the Check Period parameter. A Data Table containing the value of the variable is retrieved from the context, and then something happens, according to the value of the Mode setting:
This property defines a list of Variable Triggers.
Field Description | Field Name | |
Context Mask. This mask is resolved during trigger processing. The value the variable specified by the Variable parameter will be monitored in any context matching the mask. In most cases, this context mask points to one explicit context, being a context path, rather than a mask. | mask | |
Variable. Name of context variable to be monitored. | variable | |
Expression. Iotellect Expression used to check the variable value. The evaluation of this expression will be processed according of the Mode setting. If the expression evaluates to | expression | |
Mode. Define a behaviour of the alert. If Mode is State (true/false) trigger fires when the Expression changes from FALSE to TRUE. If Mode is State Change (any value) trigger fires when a result of the Expression changes from one value to another (not necessary TRUE/FALSE). If Mode is Dynamic Baselining (number), trigger fires if a result of the Expression is out-of-range defined in the Baselining setting. This is comprehensively described above, under variable triggers. | mode | |
Record Key Expression. Iotellect Expression used to define a key (usually it is a certain field of the Variable) when Variable has several records and they must be checked row by row. It is relevant for State (true/false) mode only. | recordKeyExpression | |
Record Key Expression Resolution Environment: | ||
|---|---|---|
Source context of the alert. | ||
Current value of the Variable. | ||
Current row of Variable's value. | ||
Standard variables only. | ||
Check Period. Time interval between inspections of Variable. | period | |
Delay. Time interval between time when trigger expression become true and time when alert is raised. | delay | |
Alert Level. Level of this alert event. | level | |
Deactivation Expression. Iotellect Expression used to check the variable value when trigger has already been activated. If the result is TRUE trigger will be deactivated. It is relevant for State (true/false) mode only. | deactivator | |
Deactivation Delay. Time interval between time when Deactivation Expression become true and time when alert is deactivated. | deactivationDelay | |
Baselining. Lower and upper threshold expressions definition. If a result of an Expression evaluation is out-of-range formed by results of Lower Threshold Expression or Upper Threshold Expression, alert will become active. | baselining | |
Flapping. Controls flapping detection for this trigger. | flapping | |
Trigger Message. Usually used to indicate the root cause of alert. | message | |
Alert Trigger Message Expression Resolution Environment: | ||
Source context of the alert. | ||
Data Table of the alert event. | ||
0 | ||
Standard variables only. | ||
These may be accessed via the variableTriggers variable.
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