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Using the Query Language 481

Using the Query Language in Rule Conditions or Derived Metric Expressions

Expressions must be specified using the query language, and the syntax

@expressionName must be used to reference expressions in messages.

Tip If you want to include an email address in a message, simply use the @ symbol twice. For

example:

Send email to administrator@@example.com

Note The expressions that you can reference in a message vary depending on the scope of the

message. See Chapter 6, “Adding severity-level variables” on page 256 for details.

You can also reference registry variables in expressions using the syntax

registry("registryVariableName").

Examples

• You are editing a simple rule that is scoped to the topology type

JVM; the

condition for the rule is

#threads_started#>10. You want to create a message

(to use as the text of the email that is sent when the rule fires) that includes the

value of the

#threads_started# metric at the time when the rule fires.

Using the controls on the Severity Level Variables tab of the Fire tab, you create

an expression called

threadsNum whose value is #threads_started#. You

then create a message called

ProblemSynopsis. The value that you set for this

message is:

Threads started count is too high: @threadsNum

In this message, the at sign ‘@’ is used to reference the threadsNum expression.

When the message shown above is included in the email,

@threadsNum will be

replaced by the number of threads that were started at the time when the rule

fired.

• There is a registry variable called

CPUFatal whose value is 90 for the topology

object to which the rule you are editing is scoped. You want to reference this

variable in the alarm message for the rule’s Fatal severity level, so you create an

expression called

CPU whose definition is registry("CPUFatal"). You then

reference this expression in the rule’s alarm message:

CPU usage is at

@CPU%

Specifying a Rule Condition or Derived Metric Expression

vFoglight provides controls above the Condition field (for a rule) or the Expression

field (for a derived metric) that allow you to insert elements into the condition or

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