Merge "Glance cluster awareness"

specs/rocky/approved/glance/spec-lite-cluster-awareness.rst

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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+===================================
+Spec Lite: Glance cluster awareness
+===================================
+
+..
+  Mandatory sections
+
+:project: glance
+
+:problem: Individual glance nodes are fully un-aware that there might be
+          other nodes operating in the same space. This lack of communication
+          between the nodes causes issues separating workers and operating in
+          different locations.
+
+:solution: We have message queues already utilized in notifications and other
+           projects. Lets expand that for communications between different
+           glance-api nodes to gain better operational efficiency.
+
+:impacts: DocImpact
+
+..
+  Optional sections -- delete any that don't apply to this spec lite
+
+:alternatives: We could use something else than the message queues but
+               effectively that would end up recreating something like registry
+               but just as a message broker.
+
+:timeline: Possible initial functionality in Rocky, more use cases covered S
+           and beyond. This can be expanded fairly easily so we can proceed as
+           time permits.
+
+:assignee: jokke