You set the

metric

property to the

PerfMetricId

of a performance metric that you want to monitor on the system. Set the

red

or

yellow

properties to identify the level at which the metric value moves from green, to yellow, to red. You must define

red

,

yellow

, or both properties. Use each of these properties with the

isAbove

or

isBelow MetricAlarmOperator

enumerations to complete the definition of the threshold.

In conjunction with

red

and

yellow

properties, you can use the

redInterval

or

yellowInterval

properties. These properties enable you to set the number of seconds that the performance metric must be in

red

or

yellow

state before the expression becomes

true

and triggers the defined action.