The reason is ceilometer has switched to use Glance v2 in image pollsters.(https://review.openstack.org/#/c/349849/) So the sample of image has not image_metadata attribute any longer.
The reason is ceilometer has switched to use Glance v2 in image pollsters.(https:/ /review. openstack. org/#/c/ 349849/)
So the sample of image has not image_metadata attribute any longer.