Write utilization now available in ISR Observability
By Steven Van ·
Observability Plus subscribers can now see which ISR routes regenerate too often relative to their traffic.
Vercel's ISR Observability page now shows a write utilization metric for Observability Plus subscribers, making it easier to spot routes that regenerate often but get few requests. Write utilization is the ratio of cached requests to ISR writes: a route with low utilization is spending writes on regeneration that few visitors actually benefit from.
For those routes, Vercel suggests increasing the revalidation interval or switching to on-demand revalidation. Write utilization can also be computed directly with the Vercel CLI, by pulling cached request counts and ISR write units per route, or investigated with a coding agent using the cdn-caching skill. See the full guide for the CLI commands and cache-reason breakdown.