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Once Page Previews has been rolled out to enwiki and dewiki, we can:
- Safely remove the instrumentation; and
- Safely (?!) archive the Popups EventLogging tables.
== AC
[] `ext.popups.core.previewCount` is deleted from localStorage, if it's present.
[] The `./counts` module is removed.
[] The following properties are removed from the `BOOT` action:
- `sessionToken`
- `pageToken`
- `page`
- `user.editCount`
- `user.previewCount`
[] The `./getBucket` module is removed.
[] The `./reducers/eventLogging` module is removed.
[] The `./changeListeners/eventLogging` module is removed.
[] The `./isEnabled` module is tidied up by removing the `bucket` parameter.
== Questions
[] When can we archive the Popups tables?
[] What does the EventLogging instrumentation tell us that the performance instrumentation doesn't?