Status: Development
This document defines semantic conventions for browser (web) instrumentations that emit events.
Status:
The event name MUST be browser.web_vital.
This event describes the website performance metrics introduced by Google, See web vitals.
Body fields:
| Body Field | Type | Description | Examples | Requirement Level | Stability |
|---|---|---|---|---|---|
delta |
double | The delta between the current value and the last-reported value. | 0.2 |
Required |
 |
id |
string | A unique ID representing this particular metric instance. | v3-1677874579383-6381583661209 |
Required |
|
name |
enum | Name of the web vital. | cls |
Required |
|
value |
double | Value of the web vital. | 1.0 |
Required |
|
name has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
cls |
Cumulative Layout Shift. | |
fid |
First Input Delay. | |
inp |
Interation to Next Paint. | |
lcp |
Largest Contentful Paint. | |