Hi Angus,

Yeah, I missed the new Nova tags, they do seem very similar to Heat’s tags. 

I should have been more clear when we discussed this on IRC regarding the 
API-WG position on filtering. I was aware of the lack of guidelines on 
filtering, and being an active member of the API-WG team I consider this a good 
opportunity to add more content on this topic.

The closest thing that we have in API-WG is a sorting guideline, which gathered 
very positive reviews. Some aspects of it, such as the structure of the URL 
arguments, can be adapted to filtering, so maybe I should take all this 
information and try to come up with generic filtering guidelines that Heat can 
use and API-WG can publish.



From: Angus Salkeld <asalkeld@... 
Subject: Re: Filtering by metadata values 
Newsgroups: gmane.comp.cloud.openstack.devel 
Date: 2015-02-11 03:03:26 GMT (1 hour and 19 minutes ago)

On Wed, Feb 11, 2015 at 8:20 AM, Miguel Grinberg <miguel.grinberg <at> 
gmail.com <mailto:miguel.grinberg-re5jqeeqqe8avxtiumw...@public.gmane.org>> 

We had a discussion yesterday on the Heat channel regarding patterns for 
searching or filtering entities by its metadata values. This is in relation to 
a feature that is currently being implemented in Heat called “Stack Tags”.

The idea is that Heat stack lists can be filtered by these tags, so for 
example, any stacks that you don’t want to see you can tag as “hidden”, then 
when you request a stack list you can specify that you only want stacks that do 
not have the “hidden” tag.

Some background, the author initially just asked for a field "hidden". But it 
seemed like there were many more use cases that could be fulfilled by having
a generic "tags" on the stack REST resource. This is really nice feature from 
UI perspective.
We were trying to find other similar usages of tags and/or metadata within 
OpenStack projects, where these are not only stored as data, but are also used 
in database queries for filtering. A quick search revealed nothing, which is 

I have spotted nova's instance tags that look like the kinda beast we are after:
  -  https://blueprints.launchpad.net/nova/+spec/tag-instances 
  -  https://review.openstack.org/#/q/topic:bp/tag-instances,n,z 


Is there anything I may have missed? I would like to know if there anything 
even remotely similar, so that we don’t build a new wheel if one already exists 
for this.

So we wanted to bring this up as there is a API WG and the concept of tags and 
filtering should be consistent
and we don't want to run off and do something that the WG really doesn't like.

But it looks like this needs a bit more fleshing out:

Should we just follow nova's instance tags, given the lack of definition in 



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