CloudHealth will alert you when unconfigured subscriptions are detected. This alert can be caused by recently deleted or no longer used.
To suppress this message go to SETUP > ACCOUNTS > Azure Enrollment. Select the active Enrollment and the status field will show "Warning".
Click on status field and the screen will show all subscriptions. Do check whether the subscription(s) is/are really obsolete.
Behind the subscriptions that are in "unconfigured" state you see a toggle box saying "toggle to ignore".
When you toggle this ON, you will no longer be alerted about that Subscription.
In the list of Subscription you will now see the column "Ignored?" being tagged with "V".