new_contents: from django.core.management.base import BaseCommand
  
  from dimagi.ext.couchdbkit import Document
  
  from corehq.util.metrics import metrics_gauge
  
  
  class Command(BaseCommand):
      help = "Display a variety of code-quality metrics, optionally sending them to datadog"
  
      def add_arguments(self, parser):
          parser.add_argument(
              '--datadog',
              action='store_true',
              default=False,
              help='Record these metrics in datadog',
          )
  
      def handle(self, **options):
          self.datadog = options['datadog']
          self.show_couch_docs_remaining()
  
      def show_couch_docs_remaining(self):
          def all_subclasses(cls):
              return set(cls.__subclasses__()).union([
                  s for c in cls.__subclasses__() for s in all_subclasses(c)
              ])
          num_remaining = len(all_subclasses(Document))
          self.stdout.write(f"CouchDB models remaining: {num_remaining}")
          if self.datadog:
              metrics_gauge("commcare.gtd.num_couch_models", num_remaining)
  
subject: Add management command to report computed stats