Comment 8 for bug 1804125

@Jeff, yeah it's gross, and taken way too long to deal with (granted, I don't think anyone noticed/appreciated this regression until ~queens, about a year after it happened).

There has been discussion about how to make the aggregate filters with the allocation_ratio metadata *work* again, discussed at the Dublin PTG:

https://etherpad.openstack.org/p/nova-ptg-rocky-placement ~L37

That solution never materialized though...

There is also this proposal:

https://review.openstack.org/#/c/544683/

Which would essentially mirror the allocation ratio metadata from the compute host aggregates API back to placement. If you have input on that spec please leave comments in the review - it's waylaid at this point.