---
fixes:
  - |
    During the havana cycle it was discovered that eventlet
    monkey patching of greendns broke ipv6.
    https://bugs.launchpad.net/nova/+bug/1164822
    Since then nova has been disabling eventlet monkey patching
    of greendns. Eventlet adressed the ipv6 limitation in v0.17
    with the introduction of python 3 support in 2015. Nova
    however continued to disable it, which can result i slow dns
    queries blocking the entire nova api or other binary
    because socket.getaddrinfo becomes a blocking call into glibc
    see: https://bugs.launchpad.net/nova/+bug/1964149 for
    more details.