title: What do I set ENV["WEB_CONCURRENCY"] to when using heroku and sidekiq
body: <p>As I'm trying to deploy my app to Heroku, I have set up the <code>procfile</code> and <code>unicorn.rb</code> file in accordance with <a href="https://devcenter.heroku.com/articles/rails-unicorn" rel="nofollow">heroku's guide</a>. However, at the top of the file there is a line </p>
  
  <pre><code>worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
  </code></pre>
  
  <p>I suppose that this wants me to set <code>WEB_CONCURRENCY=</code> inside of the <code>.env</code> file. However, I am not really sure what I should set that equal to. </p>