There is no data logged for HomepageVisit after 2020-10-26, the last received event has a timestamp of 2020-10-26T18:47:31Z. Checking logstash shows schema validation errors, specifically that start_email_state and start_tutorial_state are required properties.
From a count of the number of events in this schema, it looks like this issue started around the Variant C/D deployment on 2020-10-19, at which point the number of daily events dropped by almost 50%. The second drop coincides with the deployment of Variant D as the default (ref T265556#6579676). After that, no events are flowing in.
- Does the schema definition need updating based on the changes from Variant C & D?
- Are there changes needed to the logging code on the server side as well?