Vercel Speed Insights and Web Analytics now attribute data to custom environments
Vercel updated Speed Insights and Web Analytics so that data from deployments to custom environments is attributed to the custom environment instead of the Preview environment. Data can be viewed in the dashboard Environment dropdown, via the vc metrics CLI command, in the query builder, and through the Aggregation API (Web Analytics only).

Why it matters
Teams running staging, QA, or canary environments can now measure performance and traffic for those environments separately from Production and Preview, which previously mixed them into Preview data.
Who should care
Teams deploying to Vercel with custom environments, developers and DevOps engineers monitoring web performance, and ecommerce or online business operators using Vercel analytics.
What you can do
In your Vercel project, open Speed Insights or Web Analytics, select a custom environment from the Environment dropdown, and compare its metrics against Production and Preview.

