
254 vFoglight
Administration and Configuration Guide
•In the Rule Definition tab, use the Rule Scope area to scope the rule to one or
more topology objects.
For detail instructions, see “Setting the Scope for a Rule or Derived Metric” on
page 474.
From here, you can proceed to “Defining Conditions, Alarms, and Actions” on
page 254.
Defining Conditions, Alarms, and Actions
Simple rules have a single condition only, and can be in one of three states: Fire,
Undefined, or Normal. If the condition is met, the state of the rule is set to Fire and any
actions that are associated with this state are performed. If the condition is not met, the
rule remains in the Normal state. If the rule’s condition cannot be evaluated because
data is missing or unavailable, the state of the rule is set to Undefined. The condition for
a simple rule is regularly evaluated against monitoring data. Therefore, the state of the
rule can change if the data changes.
Multiple-severity rules can have up to five severity levels: Undefined, Fatal, Critical,
Warning, or Normal. When you create a multiple-severity rule, you must specify a
condition for one or more of the following severity levels Fatal, Critical, or Warning.
When you edit multiple-severity rules, you write a condition for each specified severity
level.
Unlike simple rules, that can have only one condition associated with their Fire state,
multiple-severity rules can have a conditional expression associated with each severity
(Warning, Critical, and/or Fatal) along with an alarm message associated with that
conditional expression. This is because simple rules do not generate alarms. They fire
when the condition for their Fire state is met. On the other hand, multiple-severity rules
generate alarms each time they enter a severity state.
As with simple rules, the conditions for a multiple-severity rule are regularly evaluated
against monitoring data. All conditions in a rule are evaluated; the severity state is set to
the highest level for which the condition evaluates to True. If none of the conditions are
met, the severity state is set to Normal. If a condition cannot be evaluated because data
is missing or unavailable, the state is set to Undefined.
For complete information about simple and multiple-severity rules, see “Defining rule
types” on page 250.
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