Metric definitions

Metric

Description

PV

The number of page views.

UV

The number of unique visitors. You must report the user_id. The reported PV data is deduplicated based on the user_id.

Metric

Description

JS Error Count

The number of JS exceptions.

JS exception rate

The number of JS exceptions / Total PV.

Users affected by JS exceptions

The number of unique visitors (UV) affected by JS exceptions.

Rate of users affected by JS exceptions

The number of UV affected by JS exceptions / Total UV.

Metric

Description

Requests

The number of requests for the path.

Users

The number of unique visitors (UV) who made requests for the path.

Request faults

The number of request faults.

Request fault rate

The number of request faults / Total number of requests.

Users affected by request faults

The number of unique visitors (UV) affected by request faults.

Rate of users affected by request faults

The number of UV affected by request faults / Total UV.

Slow requests

The number of requests that exceeded the slow request threshold.

Slow request rate

The number of requests that exceeded the slow request threshold / Total number of requests.

Users affected by slow requests

The number of unique visitors (UV) affected by slow requests.

Rate of users affected by slow requests

The number of UV affected by slow requests / Total UV.

Metric

Description

Loads

The number of times the resource was loaded.

Users

The number of unique visitors (UV) who loaded the resource.

Resource faults

The number of static resource faults.

Resource fault rate

The number of static resource faults / Total number of loads.

Users affected by resource faults

The number of unique visitors (UV) affected by static resource faults.

Rate of users affected by resource faults

The number of UV affected by static resource faults / Total UV.

Slow loads

The number of loads that exceeded the slow loading threshold.

Slow loading rate

The number of loads that exceeded the slow loading threshold / Total number of loads.

Users affected by slow loading

The number of unique visitors (UV) affected by slow loading.

Rate of users affected by slow loading

The number of UV affected by slow loading / Total UV.

Metric

Description

White screen score

The white screen score is calculated based on the DOM depth score. A smaller value indicates a more severe white screen issue.

White screens

The number of white screen occurrences.

White screen rate

The number of white screen occurrences / Total PV.

Users affected by white screens

The number of unique visitors (UV) who experienced a white screen.

Rate of users affected by white screens

The number of UV who experienced a white screen / Total UV.

Metric

Description

FP (first paint time)

The time point of the first paint. The default value is the 75th quantile.

FCP (First Contentful Paint)

The time point of the first contentful paint. The default value is the 75th quantile.

LCP (Largest Contentful Paint)

The time it takes for the largest content element on the page to finish rendering on the screen. The default value is the 75th quantile.

LOAD (page load time)

The time it takes for the page and all its dependent resources to fully load. The default value is the 75th quantile.

TTFB (Time To First Byte)

The time from when a page request is sent to when the first byte of the response data is received. The default value is the 75th quantile.

INP (Interaction to Next Paint)

The time until the next paint after an interaction. A low INP means the page can consistently respond quickly to most user interactions. The default value is the 75th quantile.

CLS (Cumulative Layout Shift)

A measure of the largest layout shift score for every unexpected layout shift that occurs during the entire lifecycle of the page. The default value is the 75th quantile.