Log events in OpenTelemetry are a subset of log records with a special field, EventName, that specifies the type of event it represents. Log events of the same type are supposed to use the same schema for their body.
(Foreshadowing: soon you are going to care a lot about log events in Dash0. Dun dun DUN!)
EventName being a field in OTLP has been an issue: support for OTLP fields is very sparse beyond the Logs API in the SDKs (with notable SDKs not having support to this day) and the OpenTelemetry Collector. Most other logging agents that can send logs over OTLP do not support fields for log records beyond timestamp, body and attributes. And since attributes are generally well supported in the ecosystem, OpenTelemetry Semantic Conventions v1.39.0 introduced otel.event.name as an attribute-level fallback for the EventName field.
In compliance with the semantic conventions, Dash0 now supports otel.event.name as fallback for the EventName field. Log records ingested via OTLP that do not have the EventName field set, are nevertheless treated as log events also when the otel.event.name attribute is present. The same applies to other structured log formats: their logs are similarly handled as log events when the top-level otel.event.name field is set.