Warning:

  Eventlet is now in maintenance mode, so only the changes who are
  related to fixing a bug or who are related to the new Asyncio hub
  will be accepted. New features outside of the scope of the Asyncio
  hub won't be accepted.Migrating off of Eventlet is strongly
  encouraged. We encourage existing users to migrate to Asyncio. For
  further details see the official migration guide.
