TraceTimelineSpan
constructor(traceId: String, spanId: String, parentSpanId: String? = null, service: String, operation: String, startEpochMs: Long, endEpochMs: Long? = null, durationMs: Long? = null, status: String, depth: Int = 0, leftPercent: Double = 0.0, widthPercent: Double = 0.0, host: String? = null, protocol: String? = null, component: String? = null, attributes: Map<String, String> = emptyMap())(source)