# Vercel Always-on tracing for production and preview traffic

- Product: Vercel (https://whatsnew.fyi/product/vercel)
- Vendor: Vercel
- Date: 2026-08-21
- Original notes: https://vercel.com/changelog/always-on-tracing-for-production-and-preview-traffic
- Permalink: https://whatsnew.fyi/product/vercel/releases/2026-08-21-always-on-tracing-for-production-and-preview-traf

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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With always-on tracing, you can now debug your real user requests without reproducing them. Always-on tracing continuously collects traces from your production and preview traffic. Unlike session trac…

- **added** — Always-on tracing continuously collects traces from production and preview traffic to debug real user requests without reproducing them