Runtime logs now show cache reasons

Short summary

Vercel runtime logs now display a Cache Reason explaining why a request was not a fresh cache hit, such as time-based or tag-based revalidation. Cache reasons appear for any CDN-cacheable response including ISR, Partial Prerendering, and functions with Cache-Control headers, but not for dynamically rendered responses. Developers can view reasons in the Logs tab, via CLI, metrics, or the Vercel plugin's cdn-caching skill to debug misses and improve hit rates.

• •Runtime logs now show Cache Reason for non-fresh cache hits
• •Covers ISR, Partial Prerendering, and Cache-Control responses
• •Available in Vercel logs, metrics, CLI, and the cdn-caching plugin skill

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