Write design doc for blushproof about blushproof HOT 5 CLOSED

Added to https://github.com/mozilla/blushproof/blob/master/doc/designdoc.md

from blushproof.

I feel like we should add a fuzz factor or otherwise limit the accuracy of the timestamps on the events we receive. Maybe just the date is enough?

from blushproof.

The timestamp is mainly for us to be able to check changes over time. I could modulo to the nearest hour. Hour is useful as a sanity check, we should see more data over the middle of the day than when people are sleeping. Day also gives as a sanity check (Wednesday is the highest traffic day) but less so -- and we won't be able to do things like gauge how often people need PB mode during work hours vs outside, etc.

We can also make it explicit that we discard personids after computing daily active users.

from blushproof.

All traffic that I've seen follows curves like this: http://www.socialnomics.net/2010/11/29/best-time-to-post/

from blushproof.

Marking done since we chatted about this last week.

from blushproof.