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Why
Since Tramline is very job-heavy and relies on them for critical tasks, we want our task queues to be reliable. This feature is available in the Sidekiq pro version but not in the open-source Sidekiq version that we use. We add this gem to add reliability to our job processing where, if the worker dies or there's a network interruption, messages are not lost (we're strictly talking about messages being processed, not the ones in scheduled / retry / dead queue).
Notes
Git-vendor the GitLab gem sidekiq-reliable-fetch directly since the previously available gem is not maintained anymore.