Add a region tier to the ring

Registered by John Dickinson

Add a region tier above zones. This allows for the existing "unique-as-possible" placement strategy to continue to work across a distributed cluster and ensures that data is as protected from failures as possible.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
Accepted for grizzly
Implementation:
Implemented
Milestone target:
milestone icon 1.8.0
Started by
John Dickinson
Completed by
Thierry Carrez

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