old_contents: import json
  from datetime import datetime
  from django.http import HttpResponse
  
  
  def heartbeat(request):
      """
      Simple view that a loadbalancer can check to verify that the app is up
      """
      output = {
          'date': datetime.now().isoformat()
      }
      return HttpResponse(json.dumps(output, indent=4))
  
new_contents: import json
  from datetime import datetime
  from django.http import HttpResponse
  from xmodule.modulestore.django import modulestore
  
  
  def heartbeat(request):
      """
      Simple view that a loadbalancer can check to verify that the app is up
      """
      output = {
          'date': datetime.now().isoformat(),
          'courses': [course.location for course in modulestore().get_courses()],
      }
      return HttpResponse(json.dumps(output, indent=4))
  
subject: Make heartbeat url wait for courses to be loaded