# Write utilization now available in ISR Observability

By Steven Van · 2026-07-16

Observability Plus subscribers can now see which ISR routes regenerate too often relative to their traffic.

[Vercel](<https://creatorstoolbox.com/tools/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](<https://vercel.com/kb/guide/how-to-reduce-isr-revalidation-costs>) for the CLI commands and cache-reason breakdown.

[![](<https://vercel.com/api/docs-og?title=How%20to%20reduce%20ISR%20revalidation%20costs&format=kb&sig=66977938006c4eab64921de8976773312883ead5a64d02be6598d7e1f2fe7762>)](<https://vercel.com/kb/guide/how-to-reduce-isr-revalidation-costs>)

![Vercel](<https://www.google.com/s2/favicons?domain=vercel.com&sz=128>)

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Sources

[Original source](<https://vercel.com/kb/guide/how-to-reduce-isr-revalidation-costs>)

[Read Write utilization now available in ISR Observability on Creators Toolbox](<https://creatorstoolbox.com/blog/vercel-write-utilization-now-available-in-isr-observability>)

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Canonical source: https://creatorstoolbox.com/blog/vercel-write-utilization-now-available-in-isr-observability