Field Name Description Timestamp Time when the event occurred. ObservedTimestamp Time when the event was observed. TraceId Request trace id. SpanId Request span id. TraceFlags W3C trace flag. SeverityText The severity text (also known as log level). SeverityNumber Numerical value of the severity. Body The body of the log record. Resource Describes the source of the log. InstrumentationScope Describes the scope that emitted the log. Attributes Additional information about the event. EventName Name that identifies the class / type of event.