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Limited tracking and consent

Noted by on his .

Assuming data is a liability, how limited should data collection be to not require consent?

I think temporary storage (a week or less) of access logs combined with low-entropy binary information (dark mode, is viewport narrower than what I test with, etc) is reasonable for a small operation. This holds if the data collection is clearly documented in a privacy policy, is Tor-friendly, and obeys signals like GPC. These access logs should exclude high-entropy headers like client hints.

Larger operations should store even less since they have the means to correlate information from many sources. ipscrub comes to mind.

The only long-term storage that should happen without consent is of bot traffic.