Feature Flag Rollout Spec Writer Prompt

Write a rollout spec for the feature flag below.
Include: flag key, data type (boolean/variant/percentage), the 4 rollout stages (internal → beta → 25% → 100%) with the gate criteria between each, the kill-switch condition, the metric to monitor at each stage, and how long to hold at each stage before promoting.

Feature: {{feature}}

Replace the {{fields}} with your own context and tighten the rules to match your domain.