@Override
    public String toString() {
        return "SpanEvent{" +
                "stackId=" + stackId +
                ", timeRecording=" + timeRecording +
                ", startTime=" + startTime +
                ", elapsedTime=" + elapsedTime +
                ", asyncIdObject=" + asyncIdObject +
                ", sequence=" + sequence +
                ", serviceType=" + serviceType +
                ", endPoint='" + endPoint + '\'' +
                ", annotations=" + annotations +
                ", depth=" + depth +
                ", nextSpanId=" + nextSpanId +
                ", destinationId='" + destinationId + '\'' +
                ", apiId=" + apiId +
                ", exceptionInfo=" + exceptionInfo +
                ", executeQueryType=" + executeQueryType +
                "} ";
    }
Span represent RPC

@author netspider
@author emeroad
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/context/SpanEvent.java