Add policy enrollment required (#58959)

Co-authored-by: James M. Greene <[email protected]>

Author: SmurfLord

content/rest/copilot/copilot-usage-metrics.md

@@ -10,4 +10,6 @@ autogenerated: rest
 allowTitleToDifferFromFilename: true
 ---
 
+To enable these endpoints, the "{% data variables.product.prodname_copilot_short %} usage metrics" policy must be set to **Enabled everywhere** for the enterprise. See [AUTOTITLE](/copilot/how-tos/administer-copilot/manage-for-enterprise/manage-enterprise-policies#defining-policies-for-your-enterprise).
+
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