Identify poorly performing relays from historical OnionPerf data
This closes the loop on legacy/trac#31435 (moved) to help us validate that the poorly performing relays have indeed been excluded as we would hope, and then we can check that we're not excluding so much performance that it would degrade the experience for everyone.
This task does not depend on legacy/trac#31435 (moved) however and can be progressed independently.
Some questions to answer:
- Low hanging fruit: are there some trends we should be aware of before we dive into this data, for example are there some "peak hours" where things are slower, or do things get slower on weekdays/weekends.
- How much data do we have to look at to identify with some certainty that a relay is slow? (1 day, 1 week, 1 month, 1 year?)
- What is our metric for "poorly performing"?
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