We have Device Uptime report which provide details of Avg up time of devices based on group/ folders, currently we dont have report which provide details which you are looking for but we can configure Deivce up/down Triggers & Alerts , when ever any up/down device event occurs it will notify through email or NMS.
You can file feature at
https://innovate.arubanetworks.com/
Regards,
Pavan
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NOTE: Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba or Hewlett Packard Enterprise.
