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Vercel Flags Evaluation Metrics

·2026.07.23 09:00

Key point

Vercel Flags has added a real-time evaluation status and metrics view for each flag.

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Details

Vercel Flags has added a real-time evaluation view to each flag's detail page. You can check the number of evaluations per minute in a time-series chart, and flag versions are displayed on the chart, allowing you to connect configuration changes with changes in evaluation figures.

Evaluation data can be grouped and filtered by the following criteria:

  • variant, reason, environment
  • SDK key, client, reporting project
  • Custom clients can be shown as separate groups via the clientName property

This allows you to verify that rollout percentages match actual serving, distinguish between target matches and default fallbacks, and identify which projects are using a specific flag.

Upgrading to @vercel/flags-core 1.6.0 or later will automatically display the metrics without any additional configuration.

vercelrolloutssdkvercel-flagsfeature-flagsevaluation-metrics
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