Looks like the original change to strip the context out of the notification payload happened in Grizzly:
https://github.com/openstack/nova/commit/d1f121265badfffd097ee983d14989b885375a0e
And regressed in Mitaka:
https://github.com/openstack/nova/commit/2910d75b28afd909af3b4ac392729ac3d5e64b65
Looks like the original change to strip the context out of the notification payload happened in Grizzly:
https:/ /github. com/openstack/ nova/commit/ d1f121265badfff d097ee983d14989 b885375a0e
And regressed in Mitaka:
https:/ /github. com/openstack/ nova/commit/ 2910d75b28afd90 9af3b4ac392729a c3d5e64b65