Speed Insights Drains Reference
Speed Insights Drains send performance metrics and web vitals from your applications to external endpoints for storage and analysis. To enable Speed Insights Drains, create a drain and choose the Speed Insights data type.
Vercel sends Speed Insights data to endpoint URLs over HTTPS when your application collects performance metrics.
The following table describes the possible fields that are sent via Speed Insights Drains:
| Name | Type | Description | Example |
|---|---|---|---|
| string | Schema version identifier | ||
| string | ISO timestamp when the metric was collected | ||
| string | Identifier for the Vercel project | ||
| string | Identifier for the project owner | ||
| number | Unique device identifier | 12345 | |
| string | Type of performance metric | , , , , , | |
| number | Metric value | 0.1 | |
| string | Origin URL where the metric was collected | ||
| string | URL path where the metric was collected | ||
| string | Route pattern for the page | ||
| string | Country code of the user | ||
| string | Region code of the user | ||
| string | City of the user | ||
| string | Operating system name | ||
| string | Operating system version | ||
| string | Client browser name | ||
| string | Type of client | ||
| string | Client browser version | ||
| string | Type of device | ||
| string | Device brand | ||
| string | Network connection speed | ||
| string | Browser engine name | ||
| string | Browser engine version | ||
| string | Speed Insights script version | ||
| string | SDK version used to collect metrics | ||
| string | SDK name used to collect metrics | ||
| string | Vercel environment | ||
| string | Vercel deployment URL | ||
| string | Identifier for the Vercel deployment | ||
| string | Attribution information for the metric |
Vercel supports the following formats for Speed Insights Drains. You can configure the format when configuring the Drain destination:
Vercel sends Speed Insights data as JSON arrays containing metric objects:
Vercel sends Speed Insights data as newline-delimited JSON objects:
When you configure a Speed Insights Drain in the Vercel UI, you can set the sampling rate to control the volume of data sent. This helps manage costs when you have high traffic volumes.
For more information on Speed Insights Drains and how to use them, check out the following resources:
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