Events seems to be processed, but not showing on web

We had a similar problem upgrading from 21.2 to 21.3. The issue for us was that switching to 21.3 made Sentry query for events from errors_local despite our consumers not writing to that Clickhouse table. We fixed this by:

  1. Upgrading to 21.4 from 21.3, which includes a migration to backfill errors_local from sentry_local
  2. Switching snuba-consumer and snuba-replacer to write to errors rather than events
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