The work logs for any INC, CHG or WO is added in the Activity Tab in SmartIT, so if you want to delete them then you need to delete them from the Worklog form like for Incident it is HPD:WorkLog.
Hope this will help you.
Hi, I do not see the records with the icon marked in the image, I only see the work notes that are traditional at the MidTier. I can not see the "Alerta SLA" message in the HPD:Work Log.
I experiencing the similar situation and not finding any solution. I think they are now part of Mongo database. Entries like these can't be purged.