Vercel Adds Write Utilization Metric to ISR Observability

Vercel's ISR Observability now shows write utilization for Observability Plus subscribers, indicating how often routes regenerate versus being served from cache. Routes with low write utilization can be optimized by increasing revalidation intervals or switching to on-demand revalidation to cut costs. The metric is also accessible via the Vercel CLI or through agents with the cdn-caching skill.