What is the scheduled task "\Microsoft\Windows\Diagnosis\Scheduled" on my Windows 8 computer?

"\Microsoft\Windows\Diagnosis\Scheduled" is a scheduled task on Windows 8 system added as part of Windows installation.

You will see "\Microsoft\Windows\Diagnosis\Scheduled" listed on Task Scheduler with the following information:

Name: Scheduled
Location: \Microsoft\Windows\Diagnosis
Description: The Windows Scheduled Maintenance Task performs 
   periodic maintenance of the computer system by fixing problems 
   automatically or reporting them through the Action Center.
Actions: Custom handler
Triggers: 
History: 
   Information 8:04:00 Task completed
   Information 8:00:48 Action completed
   Information 8:00:48 Action started
   Information 8:00:48 Task started
   Information 8:00:48 Created task process
   ...

"Scheduled" is scheduled to run with no triggers.

It is recommended to keep "\Microsoft\Windows\Diagnosis\Scheduled" enabled as a scheduled task.

⇒System Scheduled Tasks on Windows 8

⇒⇒Windows 8 Scheduled Tasks