Team:
Please see the recent incident report for eventlogging [1], [2]
TL;DR After addition of some EventBus events to MySQL we had an issue with insertion of events in which some events were dropped. This affected all schemas. Events for al schemas have been backfilled as of now.
[1] https://wikitech.wikimedia.org/wiki/Incident_documentation/20170711-EventLog...
[2] https://wikitech.wikimedia.org/wiki/Analytics/Systems/EventLogging#Changes_a...