Review default Sidekiq Cluster max concurrency
With the recent switch to Sidekiq Cluster it's max concurrency was set to 50. This is probably too high for most setups and indeed the Sidekiq developers in the past have suggested lower is better although today they do say at the very max it should be 50 (where I assume the value came from and the language used is more of "if you have to" rather than a recommendation).
Having a max concurrency set so high has implications for performance, specifically memory usage under high loads. Task is to review (and test) the default max concurrency recommendations and update the docs to reflect this.
Edited by Grant Young