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## Problem Currently we do a large number of heatmap uploads for tiny tenants. "tiny" in this context is defined as being less than a single layer in size. These uploads are triggered by atime changes rather than changes in the set of layers. Uploading heatmaps for atime changes on small tenants isn't useful, because even without bumping these atimes, disk usage eviction still avoids evicting the largest resident layer of a tenant, which in practice keeps tiny/empty tenants mostly resident irrespective of atimes. ## Summary of changes - For tenants smaller than one checkpoint interval, only upload heatmap if the set of layers has changed, not if only the atimes have changed. - Include the heatmap period in the uploaded heatmap, as a precursor to implementing https://github.com/neondatabase/neon/issues/6200 (auto-adjusting download intervals to match upload intervals)