https://bugzilla.wikimedia.org/show_bug.cgi?id=65500
--- Comment #1 from nuria ---
Just a note about wording as terminology in this bug is confusing. We are
mixing sampling ratio (1:100) with, let's say, a 'statistical sample' (a set
of users/requests with a different treatment from the majority).
>In some cases, sampling needs to be applied to all events (so that, for
>example, >only 1 out of 1000 events is logged)
Even if we keep track of ratio sampling in the schema (up for discussion) that
likely just be an informative number on the short term. It likely will not be
used to decide whether an event needs to be created and logged as doing those
types of checks every time an event is generated could turn out to be a
performance bottleneck (this depends on caching policies and bootstrapping of
schemas)
> In other cases, unique clients need to be sampled
> by setting a session token so that only data for
>clients included in the sample is collected.
I do not think we want EL in any to keep track of users or sessions to decide
whether data needs to be logged. EL is a light system to keep track of events
and as such it is agnostic to the events being logged. I do not see us doing
any modifications on this regard to EL clients in the near future.
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