Single Alarm State Lunch and Learn: Sept 6, 2018
Channel: OpenNMS
Date: 28/09/2018

OpenNMS Horizon 23 changes the way problems are represented as Alarms with some significant changes:

1) No longer are problems tracked with a Down (problem Alarm) and an Up (resolution Alarm). Now, a single alarm is used for tracking the problem state by moving from a Warning/Minor/Major/Critical severity to a severity of Cleared and only incrementing the counter when moving from resolved state back to a problem state.

2) A new flag is introduced to control the "reopening" of an existing Alarm and forcing the system to create a new Alarm if a previous Alarm is still in the system.

3) Drools is introduced to replace the SQL based "Automations" used to manage the state of Alarms.