Rails/Sidekiq/designe:工作是否由Sidekiq处理?我怎么确定?

我设置了designe以异步方式发送电子邮件,如下所示:

class User < ApplicationRecord
  ...

  def send_devise_notification(notification, *args)
    DeviseMailerJob.perform_now(devise_mailer, notification, id, *args)
  end
end

class DeviseMailerJob < ApplicationJob
  queue_as :mailers

  def perform(devise_mailer, method, user_id, *args)
    user = User.find(user_id)
    devise_mailer.send(method, user, *args).deliver_now
  end
end

我的 sidekiq.yml 看起来像这样:

---
:concurrency: 5
:queues:
  - mailers

我可以进入注册页面,注册,然后我会看到日志中的一切都正常:

2018-10-09T10:02:27.793848+00:00 app[web.1]: I,
[2018-10-09T10:02:27.793770 #4]  INFO -- :
[646a58f7-9588-4a1f-a258-9fbede3cf87d] [ActiveJob] [DeviseMailerJob]
[5ceac77e-d498-4436-8f12-7cd4aff2c004] Performed DeviseMailerJob (Job ID:
5ceac77e-d498-4436-8f12-7cd4aff2c004) from Sidekiq(mailers) in 3301.06ms

做

对于Heroku来说,最好的方法是什么来判断Sidekiq是否在处理工作?我的代码中有没有任何东西表明Sidekiq没有处理这个任务?