Vercel adds live evaluation metrics and CLI version history to feature flags

Vercel Changelog·medium signal

Vercel shipped two Flags changes: a live evaluation view charting evaluations per minute with flag versions marked on the timeline, and a new `vercel flags versions <flag>` command printing full revision history from the CLI. Together they close the loop between changing a flag and seeing traffic shift. For AI features shipped behind flags, per-version evaluation charts are how you attribute a behavior change to a specific rollout.