Daily Stats plot out the various aggregate statuses of products in your feed based on a running 30 day outlook. Click on any particular channel to view its specific chart.
Note Pending Products: Typically a Google-only metric, this indicates that Merchant Center is currently reviewing your account. This can last for up to 72 hours, however it is not uncommon for it to take longer.
Statuses (Pending, Active, Disapproved, Expiring) are represented in unique colors for differentiation.
You will note changes in your feed diagnostics based on the chart:
You can also filter the chart to display only select approval statuses: