Document behavior of Tasks without a fairness key#4367
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Adds a paragraph to the "How Fairness works" section explaining what happens when a Task does not have a
fairness_keyset.Why
The docs explain weighted dispatch between named fairness keys but are silent on unkeyed requests — a common scenario for teams adopting Fairness incrementally. Without this, users reasonably wonder whether unkeyed Tasks bypass Fairness entirely or get dropped into an undefined state.
The actual behavior (confirmed in server code): unkeyed Tasks are grouped under an implicit empty-string key, participate in round-robin dispatch with weight 1.0, and do not bypass Fairness.
Checklist
┆Attachments: EDU-6135 Document behavior of Tasks without a fairness key