In my last PR, I broke the MiniScheduler::Web integration by accident:
The current release (v0.19.0) throws errors the moment you call require “mini_scheduler/web”. Root cause is a change in the API that Sidekiq::Web provides to register extensions. This wasn’t noticed in testing, simply because there were no tests for that module (I assumed there were, but didn’t double check 
).
I have prepared another PR to remedy this: Fix MiniScheduler::Web integration with Sidekiq 8 by dmke · Pull Request #68 · discourse/mini_scheduler · GitHub