Catalog
Catalog attributes are what make the reports sliceable — you can only compare profit by brand, category, or size if those values are actually present on your products. The attribute registry therefore reports coverage for each one, so you can see which dimensions are safe to group by.
Coverage is measured against your whole active catalog rather than the report window you happen to be looking at, so the figure does not move as you change dates.
Catalog coverage
How many of your active products carry a value for this product label — always the whole catalog, never a report window.
Where this label appears
Where a label appears: as a column on Products, in reports, both, or neither — each is switched independently.