Introduce PopupsAnonsExperimentalGroupSize config variable. This defines
a population size who will be subject to experimentation. If the group
size is undefined or 0 (default) and PopupsBetaFeature is false
(default value) Popups will be enabled for everyone. If it is any other
value, half that group will see page previews.
Drop the config variable PopupsSchemaSamplingRate - we will now only
EventLog when an experiment is occuring. This means we can simplify the
MWEventLogger class as shouldLog will always be truthy. Given server
side eventlogging is only used for preference changes
traffic should be low and not need sampling.
Introduce getUserBucket which determines whether a user is in a bucket
on, off or control based on the value of
PopupsAnonsExperimentalGroupSize. Add tests showing how these
buckets are calculated.
Caution:
A kill switch wgPopupsEventLogging is provided for safety.
It defaults to false. Before merging, please check if any config changes
are necessary.
Bug: T171853
Change-Id: If2a0c5fceae78262c44cb522af38a925cc5919d3
Changes:
- introduced new UserPreferencesChangeHandler class that listens to
PreferencesFormPreSave hook
- introduced wrapper for EventLogging extension plus NullLogger when
EventLogging extension is not availalbe
- when user changes PagePreview to disabled system will trigger
disabled event
Bug: T167365
Change-Id: I63faecb0495eb30a9fc2763e7ddf3944baf7f55a
