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Working with vFoglight Rules and Registry 223
Working with Rules
Working with Rules
vFoglight allows you to create flexible rules that can be applied to complex, interrelated
data from multiple sources within your distributed system. You can associate several
different actions with a rule, configure a rule so that it does not fire repeatedly, and
associate a rule with schedules that define when it should and should not be evaluated.
The following list introduces you to the concepts and terms related to rules.
Rule. A rule is a piece of business logic that links a condition with a result. The
result may be linked to actions. There are two types of rules in vFoglight: simple
rules and multiple-severity rules. A rule includes a scope, conditions, expressions,
messages, and actions.
Rule Scope. The scope of a rule defines the set of topology objects against which
it will run. The scope object is the object on which alarms will appear in the
vFoglight interface.
Simple Rule. A simple rule runs user-defined actions when the condition for that
rule is met. Simple rules do not create alarms and unlike multiple-severity rules
(see below), they don't have severity levels. A simple rule is logic that is triggered
by data. See “Defining rule types” on page 250 for more information.
Multiple-Severity Rule. A multiple-severity rule is a more complex type of rule
that can include up to five levels of severity. These levels are described in more
detail in “Defining rule types” on page 250. This type of rule always creates an
alarm when the condition associated with one of its severity levels is met.
Severity State. A severity state is the highest severity condition of a multiple-
severity rule that evaluated to true.
Fire Prevention. A group of settings that prevent actions and alarms from firing
repeatedly for a rule.
Effective Period. A scheduled period during which a rule is active.
Blackout Period. A scheduled period during which a rule is inactive.
Monitoring Data. Data that has been collected from your monitored environment
by the agents and transformed into a standard format for use by the vFoglight
Management Server. Monitoring data includes both metrics and topology object
properties.
Function. Rule conditions and expressions are matched against monitoring data.
Functions cause calculations to be performed on the data specified in conditions
and expressions, allowing the data to be modified before it is matched.
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