A duplicate GUID error in the ec_alert table referencing an issue with a primary key keeps showing up in the Server logs on the NS. It can eventually cause alerts to stop triggering.
( Exception Details: System.Data.SqlClient.SqlException: Violation of PRIMARY KEY constraint 'PK_ec_alert'. Cannot insert duplicate key in object 'dbo.ec_alert'. The duplicate key value is (60b32377-7c0a-4f4f-82cc-182aae50595d)"
*Note the GUID referenced will be different and may be different every time the error occurs.
The cause of this issue is unknown at this time.
This issue can be resolved by completely purging the tables ec_alert and ec_alert_pooled.
To purge the tables open Microsoft SQL Server Management Studio and run the following queries:
delete from ec_alert
delete from ec_alert_pooled
This should clear all of the data in the tables and allow the Event Console to function normally thereafter.