As per the instrumentation spec for the Donate Button A/B Test, the Web Team requires two contextual attributes that are not currently included in the web/base stream.

Initially, they wanted to use a different stream (reader_donate_entry_point_experiments) but we don't currently support that -- all of our experiments run on a single stream.

Given that we need to focus on SDS2.4, we are looking to add the specific contextual attributes to the base stream _temporarily_, to enable the team to make a decision.

Out of Scope/Future Work:

• Should we learn that teams need to specify specifics streams for specific experiments, we may need to provide a way for them to specify that their experiment will use a different stream. One idea was to configure the experiment: this experiment is associated with this stream. Every time you talk about this experiment, they should go to this stream. See 0:28 in this recording

Acceptance Criteria:

• Add mediawiki_skin and mediawiki_database as contextual attributes in web/base stream
• Update documentation and unit tests