Extract cache download statistics by derivation name

If we can obtain cache hit statistics, we may be able to better determine which packages are truly unused. Is this possible (considering our reliance on S3 and CDN?)

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Yes: infra/metrics/fastly/README.md at 45208209bc8f652c239b06c8c477092657cbd2c4 · NixOS/infra · GitHub

But you’ll find that the data is noisy and hard to make sense of.

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