Built-in metrics in the New RUM Experience

Latest Dynatrace
Reference
Published Mar 16, 2026

The New RUM Experience offers a comprehensive set of built-in metrics, which are listed below. To learn how these metrics correspond to RUM Classic metrics, refer to RUM metrics upgrade.

General frontend metrics

Metric key	Metric name and description	Unit	Dimensions
`dt.frontend.error.count`	Frontend error count Counts the number of errors.	count	`frontend.name` `dt.rum.application.entity` `error.type` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `app.short_version` `url.provider`
`dt.frontend.request.count`	Frontend request count Counts the number of requests.	count	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `url.provider` `http.response.status_code_class`
`dt.frontend.request.duration`	Frontend request duration Measures the duration of requests.	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `url.provider` `http.response.status_code_class`
`dt.frontend.session.active.estimated_count`	Frontend app active user sessions Estimates the number of active user sessions using stochastic cardinality estimation based on the UltraLogLog (ULL) algorithm.	count	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `app.short_version`
`dt.frontend.user.active.estimated_count`	Frontend app unique active users Estimates the number of unique active users, determined by `dt.rum.instance.id`. The metric is calculated using stochastic cardinality estimation based on the UltraLogLog (ULL) algorithm.	count	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `app.short_version`
`dt.frontend.user_action.duration`	Frontend user action duration Measures the duration of user actions.	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `app.short_version`
`dt.frontend.user_action.count`	Frontend user action count Counts the number of user actions.	count	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type` `app.short_version`

Metrics for web frontends

Metric key	Metric name and description	Unit	Dimensions
`dt.frontend.web.page.largest_contentful_paint`	Frontend Largest Contentful Paint (LCP) Reports the LCP value in page summary events. LCP is the time to render the largest element in the viewport; see Largest Contentful Paint (LCP).	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`
`dt.frontend.web.page.first_input_delay`	Frontend First Input Delay (FID) Reports the FID value in page summary events. FID is the time from the first user interaction to when the browser can respond; see First Input Delay (FID).	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`
`dt.frontend.web.page.interaction_to_next_paint`	Frontend Interaction to Next Paint (INP) Reports the INP value in page summary events. INP measures how long a page takes to visually respond after a user interaction; see Interaction to Next Paint (INP).	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`
`dt.frontend.web.page.cumulative_layout_shift`	Frontend Cumulative Layout Shift (CLS) Reports the CLS value in page summary events. CLS measures unexpected shifts of visible webpage elements; see Cumulative Layout Shift (CLS). Note: The CLS metric is stored as a long value by multiplying the original value by `10,000`. To convert it back to a double value between 0 and 1, multiply by `0.0001`.		`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`
`dt.frontend.web.navigation.dom_interactive`	Frontend DOM Interactive Reports the `domInteractive` value from W3C navigation timings. DOM interactive is the time until a page is ready to receive input; see PerformanceNavigationTiming: domInteractive property.	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`
`dt.frontend.web.navigation.load_event_end`	Frontend Load Event End Reports the `loadEventEnd` value from W3C navigation timings. Load event end is the time to complete the load event of a page; see PerformanceNavigationTiming: loadEventEnd property.	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`
`dt.frontend.web.navigation.time_to_first_byte`	Frontend Time to First Byte Measures the time until the first byte of the response is received from the server, cache, or local resource. Derived from W3C navigation timings; see Time to First Byte (TTFB).	ms	`frontend.name` `dt.rum.application.entity` `device.type` `geo.country.iso_code` `browser.name` `os.name` `dt.rum.user_type`

Metrics for mobile frontends

Metric key Metric name and description Unit Dimensions

Metric key	Metric name and description	Unit	Dimensions
`dt.frontend.mobile.app_start.count`	Frontend app start count Counts the number of application starts.	count	`app_start.type` `frontend.name` `dt.rum.application.entity` `geo.country.iso_code` `os.name` `dt.rum.user_type` `app.short_version`
`dt.frontend.mobile.app_start.duration`	Frontend app start duration Measures the duration of application starts.	ms	`app_start.type` `frontend.name` `dt.rum.application.entity` `geo.country.iso_code` `os.name` `dt.rum.user_type` `app.short_version`

dt.frontend.mobile.app_start.count

Frontend app start count

Counts the number of application starts.

count

app_start.type
frontend.name
dt.rum.application.entity
geo.country.iso_code
os.name
dt.rum.user_type
app.short_version

dt.frontend.mobile.app_start.duration

Frontend app start duration

Measures the duration of application starts.

app_start.type
frontend.name
dt.rum.application.entity
geo.country.iso_code
os.name
dt.rum.user_type
app.short_version