Long task

  • Reference
  • Published Jan 14, 2026

Long task

Semantic conventions for long task events in Dynatrace RUM. Long task capturing is an upcoming feature of RUM JavaScript that will be available soon.

Query

This query searches for all long tasks.

fetch user.events
| filter characteristics.has_long_task == true

Long task characteristics

AttributeTypeDescriptionExamples
characteristics.classifierstringexperimental
Fixed value other.
other
characteristics.has_long_taskbooleanexperimental
Fixed value true.
true

Long task attributes

AttributeTypeDescriptionExamples
long_task.namestringexperimental
One of the following strings refers to the browsing context or frame that can be attributed to the long task: cross-origin-ancestor, cross-origin-descendant, cross-origin-unreachable, multiple-contexts, same-origin-ancestor, same-origin-descendant, same-origin, self, unknown.
cross-origin-ancestor
long_task.attribution.container_idstringexperimental
The ID of the container where the long task happened.
app-iframe
long_task.attribution.container_namestringexperimental
The name of the container where the long task happened.
app-iframe
long_task.attribution.container_srcstringexperimental
The source of the container where the long task happened.
http://www.dynatrace.com
long_task.attribution.container_typestringexperimental
The type of container where the long task happened.
iframe
long_task.attribution.namestringexperimental
The name of the attribution.
unknown

Long task user action attributes

Only available in case a user action was active during the long task.

AttributeTypeDescriptionExamples
user_action.instance_iduidexperimental
The ID of the active user action. The user_action.instance_id is an 8-byte ID and hex-encoded if shown as a string.
f76281848bd8288c