Migrating from DelayedJob to Sidekiq reminded me of some of the gotchas around when and where Sidekiq workers are queued up.

I recently heard about the gem, Isolator, that made my migration easier by pointing out some potential issues with the current queueing but helped to explain to others what the issues behind that are:

https://www.antonivanopoulos.com/til-queuing-sidekiq-workers-safely-with-the-help-of-isolator/