old_contents: from __future__ import absolute_import
  
  from time import time
  
  from sentry import options
  
  from .base import StatusCheck, Problem
  
  
  class CeleryAliveCheck(StatusCheck):
      def check(self):
          last_ping = options.get('sentry:last_worker_ping') or 0
          if last_ping >= time() - 300:
              return []
          return [
              Problem("Background workers haven't checked in recently. This can mean an issue with your configuration or a serious backlog in tasks."),
          ]
  
new_contents: from __future__ import absolute_import
  
  from time import time
  
  from django.core.urlresolvers import reverse
  
  from sentry import options
  from sentry.utils.http import absolute_uri
  
  from .base import Problem, StatusCheck
  
  
  class CeleryAliveCheck(StatusCheck):
      def check(self):
          last_ping = options.get('sentry:last_worker_ping') or 0
          if last_ping >= time() - 300:
              return []
          return [
              Problem(
                  "Background workers haven't checked in recently. This can mean an issue with your configuration or a serious backlog in tasks.",
                  url=absolute_uri(reverse('sentry-admin-queue')),
              ),
          ]
  
subject: Add link to queue graphs for `CeleryAliveCheck` result.