Alarm Execution Model

Alarm activation and deactivation

When a data message is received, for each alarm trigger and data tuple, alarm activation and deactivation rules are evaluated.

Only the activation rule is defined

When there is no deactivation rule defined.

Activation rule?	Action
yes	Create new alarm
no	Do nothing

Both activation and deactivation rules are defined

When both the activation and deactivation rules are defined.

Activation rule?	Deactivation rule?	Alarm active?	Action
no	no	no	Do nothing
no	no	yes	Do nothing
no	yes	no	Do nothing
no	yes	no	Deactivate alarm
no	yes	yes	Create new active alarm
yes	no	yes	Update last-seen of active alarm
yes	yes	no	Create new inactive alarm
yes	yes	yes	Deactivate active alarm, and create new active alarm