Summary
On July 23, 2026, Vercel added a live evaluation view to each feature flag's detail page, charting evaluations per minute over time with each flag version marked, and filterable by variant, reason, environment, SDK key, client, and project. Metrics collect automatically with @vercel/flags-core 1.6.0 or later.
What changed
Vercel Flags now shows evaluation metrics on each flag's detail page: evaluations per minute charted over time with flag versions marked, filterable and groupable by variant, reason, environment, SDK key, client, and reporting project. It requires @vercel/flags-core v1.6.0+ and collects automatically with no extra setup.
Why it matters
Feature-flag observability closes the loop between a config change and its real-world effect, letting teams confirm rollout percentages match served values and spot targeting mistakes fast. It moves Vercel Flags from a toggle mechanism toward a controlled-rollout and progressive-delivery tool competitive with dedicated flag platforms.
Evidence excerpt
Evaluations per minute charted over time, with each flag version marked in the chart.