Here is the signalling code we use
https://github.com/openstack/heat-templates/blob/master/hot/software-config/elements/heat-config/os-refresh-config/configure.d/55-heat-config#L121
Here is the signalling code we use
https:/ /github. com/openstack/ heat-templates/ blob/master/ hot/software- config/ elements/ heat-config/ os-refresh- config/ configure. d/55-heat- config# L121