Did Alert Grouping change in Wasihngton DC release?

[StephenM]

We recently upgraded from Vancouver to Washington DC and I have noticed very poor alert grouping in Event Management.  I am not sure if it has to do with the release or something else. 

I see patterns that have over 4k alerts that are largely unrelated.  also the time window seems very strange. 

example, 

Time Window ID: 1970-01-01 00:00:00_1969-12-31 23:59:59 (4289)

[Sayali_Suryawan]

Hello StephenM

The grouping relies on assignment groups. For example, cmdb_ci.support_group,IntegrationGroup, and this is done due to the system property "evt_mgmt.alert_auto_assignment_field"

Please refer "Introducing Alert Assignment Groups in the Washington Release"

https://www.servicenow.com/community/itom-blog/introducing-alert-assignment-groups-in-the-washington...

And 

"Assigning alert assignment group precedence"

https://www.servicenow.com/docs/bundle/xanadu-it-operations-management/page/product/event-management...

Please mark my answer if it was helpful.
Thank you