title: Busy workers from hours ago with Sidekiq
body: <p>When looking at the Sidekiq admin UI, in the workers tab I see two workers, which started 22 hours ago.</p>
  
  <p>I want to know how can I clear that, because when I do 'Clear workers list' they get cleaned, but when launching another worker, they appear again.</p>
  
  <p>What should I do in order to remove those workers?</p>