Add sharding support to API

Registered by Eric Day

This will enable users to specify an optional key per query and pool of servers to choose from after hash.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Low
Drafter:
None
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
Accepted for 5.2
Implementation:
Not started
Milestone target:
None

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