Status: Experimental
This document describes the attributes of standalone Events that are represented
in the data model by LogRecords. Events are recorded as LogRecords that are shaped
in a special way: Event LogRecords have the attributes event.domain
and event.name (and possibly other LogRecord attributes).
The event.domain attribute is used to logically separate events from different
systems. For example, to record Events from browser apps, mobile apps and
Kubernetes, we could use browser, device and k8s as the domain for their
Events. This provides a clean separation of semantics for events in each of the
domains.
Within a particular domain, the event.name attribute identifies the event.
Events with same domain and name are structurally similar to one another. For
example, some domains could have well-defined schema for their events based on
event names.
When recording events from an existing system as OpenTelemetry Events, it is possible that the existing system does not have the equivalent of a name or requires multiple fields to identify the structure of the events. In such cases, OpenTelemetry recommends using a combination of one or more fields as the name such that the name identifies the event structurally. It is also recommended that the event names have low-cardinality, so care must be taken to use fields that identify the class of Events but not the instance of the Event.
| Attribute | Type | Description | Examples | Requirement Level |
|---|---|---|---|---|
event.name |
string | The name identifies the event. | click; exception |
Required |
event.domain |
string | The domain identifies the business context for the events. [1] | browser |
Required |
[1]: Events across different domains may have same event.name, yet be
unrelated events.
event.domain 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 |
|---|---|
browser |
Events from browser apps |
device |
Events from mobile apps |
k8s |
Events from Kubernetes |