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Trigger Condition Expression
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Last updated: 2024-01-20 17:59:35
Trigger Condition Expression
Last updated: 2024-01-20 17:59:35
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A trigger condition expression is used to determine whether to trigger an alarm. The query analysis result of the monitoring object is input as a variable for the trigger expression. If the expression is true, an alarm will be triggered.

Syntax Description

Operator
Description
Example
$N.keyname
Imports the query analysis result. N is the monitoring object number, keyname is the field name in the query analysis result (which must start with a letter and can contain letters, digits, and underscores. We recommend you use the AS syntax to set an alias for the result.)
$1.ErrCount
+
Addition operator
$1.ErrCount+$1.FatCount>10
-
Subtraction operator
$1.Count-$1.InfoCount>100
*
Multiplication operator
$1.RequestMilSec*1000>10
/
Division operator
$1.RequestSec/1000>0.01
%
Modulo operator
$1.keyA%10==0
==
Comparison operator: equal to
$1.ErrCount==100
$1.level=="Error"
>
Comparison operator: greater than
$1.ErrCount>100
<
Comparison operator: less than
$1.pv<100
>=
Comparison operator: greater than or equal to
$1.ErrCount>=100
<=
Comparison operator: less than or equal to
$1.pv<=100
!=
Comparison operator: not equal to
$1.level!="Info"
()
Parentheses for controlling the operation priority
($1.a+$1.b)/$1.c>100
&&
Logical operator: AND
$1.ErrCount>100 && $1.level=="Error"
||
Logical operator: OR
$1.ErrCount>100 || $1.level=="Error"
An alarm will be triggered only if the expression is true. For example, if the calculation result of $1.a+$1.b is 100, no alarms will be triggered; if the result is greater than or equal to 100, an alarm will be triggered.
keyname in $N.keyname is the field name of the query analysis result. It must start with a letter and can contain letters, digits, and underscores, such as level:error | select count(*) AS errCount. errCount can be directly used as keyname in the trigger condition expression. If the field name contains special symbols, you need to enclose the imported variable with [], such as [$1.count(*)]. We recommend you use an AS analysis statement to set an alias for the result field name.
Up to three monitoring objects can be set in an alarm policy. Each one is identified by a number starting from 1. For example, $1.key1 imports the key1 field name in the query whose number is 1, and $2.key2 imports the key2 field name in the query whose number is 2.
If multiple values are returned in the query analysis result, the expression will be calculated according to the values for up to 1,000 times or until the calculation result is true. For example, if the expression is $1.a+$2.b>100, analysis 1 returns m results, and analysis 2 returns n results, then the expression will be calculated for m * n times, and calculation will stop when $1.a+$2.b>100 is true or after 1,000 times of calculation.
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