Horizon uses a network’s managed entities, their resources, the services they provide, and any applications that they host to monitor problem states.
While events carry immutable problem state attributes such as severity, alarms indicate problems in the network (see Business Service Monitoring) and carry changeable attributes such as acknowledgment.
An alarm is instantiated on the first occurrence of a
service-down alarm created
Click the number displayed in the Count column to display the corresponding events and their details:
The alarm is cleared immediately when service is restored, and no alarm is created when the service returns to a normal state:
If the problem occurs again, the events are reduced into the existing alarm. The alarm’s count is updated to reflect the new activity:
The alarm is once again cleared immediately when service is restored:
Note that the alarm’s count does not increment when the problem is resolved.