You can check this on any site → scroll down to the "Metrics (application maintenance plan)" option. There you can see the indicators on all sites that are in the plan and filter the data the way you want:

Update 2018-12-04
Check other answers for more details as experience develops and changes over time. And stop voting only because you came in 2 years. I will not include the current solution / screenshots here, because it will be unfair to other participants. And I can’t delete this answer because it is accepted (because it was correct in time and answered).
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