Cases are used to open and track observability issues directly in the Elastic Observability app. All cases list the original reporter and all the users who contribute to a case (participants). You can also send cases to third party systems by configuring external connectors.
If you create cases in Stack Management or the Elastic Security app, they are not visible in Observability. Likewise, the cases you create in Observability are not visible in Stack Management or the Elastic Security app. You also cannot attach alerts from Stack Management or the Elastic Security app to cases in Observability.