Task for discussing the integration of the new MEP client for the Android Wikipedia app. Subtasks can be created as needed.
Found differences between event counts on MEP and Legacy tables, on further investigation the most obvious difference is based on presence of app_install_id where users on Legacy were not showing up at all on MEP. This anomaly was mostly isolated to event ipblock. The ipblock is the event with the highest counts on both tables. (Superset data table
Engineering has speculated that this may be caused by users quitting the app after receiving the ipblock notice and therefore their eventa data is not sent from client. There is also a possibility that the bundling of events we are using for sending data to MEP is an issue.
The plan is to change how clients send events on user app close, which @Sharvaniharan will implement for next available release, after which we will see if that explains data loss. Another possibility to un-bundle events sent to MEP if we find the first test doesn't resolve data loss.
Counts below are app_install_ids that do not appear in the corresponding table, by event: