The ISR Observability page now shows Observability Plus subscribers a write utilization metric, helping identify routes that regenerate often but receive few requests. Write utilization is the ratio of cached requests to ISR writes. For routes with low write utilization, consider increasing the revalidation interval or switching to on-demand revalidation to reduce costs.

The ISR Observability page showing the new write utilization column.

You can also compute write utilization using the Vercel CLI, or use agents with the cdn-caching skill to investigate.

# Find the total number of cached requests for each page

vercel metrics vercel.request.count -S < team > -p < project > \

-f "environment eq 'production' and (cache_result eq 'HIT' or cache_result eq 'STALE')" \

--group-by route -a sum --since 24h

# Find pages with high ISR writes

vercel metrics vercel.isr_operation.write_units -S < team > -p < project > \

-f "environment eq 'production'" --group-by route -a sum --since 24h

Fetching the two metrics…