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+---
+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.