AI BriefingWrite Utilization Metric Added to ISR Observability
Key point
A write utilization metric has been added to Vercel ISR Observability, making it possible to identify inefficient revalidations.
Details
Vercel has added a write utilization metric to the ISR Observability page. This feature is available to Observability Plus subscribers and shows the ratio of cached requests to ISR revalidations.
This makes it possible to identify inefficient routes where revalidation happens frequently but actual requests are low. For routes with low write utilization, costs can be reduced by increasing the revalidation interval or switching to on-demand revalidation.
Lookup via the Vercel CLI is also possible. The vercel metrics command can be used to query the number of HIT/STALE cache requests and ISR write units for each route to calculate write utilization. It can also be investigated using the cdn-caching plugin from skills.sh.
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