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While reviewing specs I've come across several related to adding more or 
exposing existing metrics monitors from nova-compute. At the Newton 
midcycle we discussed how we were going to freeze feature requests like 
this and start deprecating this capability, at least open-ended until 
there is a clear replacement or alternative. None of that is mentioned 
in the devref though, so I've posted a change with wording about that here:

https://review.openstack.org/#/c/385219/

You'll also note there is a change below that one:

https://review.openstack.org/#/c/385203/

which updates the 'out of tree' section in that same document to 
explicitly point out that hooks/extension points/classloading 
managers/services/drivers are also actively being deprecated and 
removed. That's a topic that has come up several times over the past few 
releases so we need to be clear about it in the documentation.

I've added the nova-core team to both reviews so we're all on the same 
page within the core team, but also sending this out as an FYI so 
everyone working on the project is aware and can raise concerns in the 
reviews if they feel the need.

-- 

Thanks,

Matt Riedemann