A fix for this issue has been deployed. Deleting resources in Azure will now properly end related alerts. If you have any further questions or concerns, please contact us at https://support.paloaltonetworks.com/.
Posted Aug 09, 2018 - 14:36 PDT
We have a potential solution now in QA and will provide additional updates as we approach release.
Posted Feb 14, 2018 - 10:40 PST
Currently, if an Azure external account does not have real-time alerting configured, alerts will not end when related resources are deleted. The root cause has been identified and engineering is actively working to fix this. For an immediate workaround you can configure real-time alerting (http://docs.evident.io/#azure-logs).