On Tue, Sep 24, 2024 at 12:33 PM Nick Alexander <[email protected]>
wrote:
> Tom,
>
> No substantive comment on the meat of the proposal: it sounds like a
> reasonable idea to me.
>
> The new telemetry probes respect the existing Telemetry opt-out settings.
>> They can also be disabled individually by setting
>> “toolkit.telemetry.user_characteristics_ping.opt-out” to true. The
>> telemetry collection will not be sent from every client, it will be
>> requested from a random sampling of users. Over time we may expand the
>> collection in order to inform research for developing fingerprinting
>> protections.
>>
>
> I'm interested in this "random sampling of users", but I don't see
> anything about this in the linked public Decision Brief. In fact, my
> reading of the Decision Brief says "all clients once, and then maybe again
> in the future", but I could be wrong, or the approach may have evolved.
> Can you link to more details? I'm particularly interested in the technical
> mechanism (client coin flips?) and the power calculations that go into
> determining the sampling rate.
>
We didn't do anything special for that - we're just relying on Nimbus. The
Decision Brief is supposed to convey that when we get to Release, we'll
just do a small sample size initially ("Limit roll-out through Nimbus") but
if it's unclear somewhere I can tweak it. I am hopeful that we won't need
to collect data from all clients on Release, but since we ultimately are
looking to protect the most unique users I don't know for certain the point
at which we will have a statistically significant sample size. We do
intend to do one collection (one ping/enrolled user) initially and
eventually a follow-up to validate our efforts and measure how less
fingerprintable our users are.
-tom
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