setup.scala

      private val tracerConfig = new Configuration(
        config.getString("lora-server.jaeger.service-name"),
        if (config.getBoolean("lora-server.jaeger.constant-sampling"))
          new SamplerConfiguration("const", 1)
        else new SamplerConfiguration(),
        new ReporterConfiguration(
          true, // logSpans
          config.getString("lora-server.jaeger.agent-host"),
          config.getInt("lora-server.jaeger.agent-port"),
          config.getDuration("lora-server.jaeger.flush-interval").toMillis.toInt,
          config.getInt("lora-server.jaeger.max-buffered-spans")
        )
      )

...

        val tracer = tracerConfig.getTracer

usage.scala

  def dataUpReceivedToDecryptEventBegin(spanContext: SpanContext): Span = {
    val scope =
      tracer
        .buildSpan("data-up-received-to-decrypt")
        .addReference(References.FOLLOWS_FROM, spanContext)
        .startActive(false)
    try {
      scope.span()
    } finally {
      scope.close()
    }
  }

  def dataUpReceivedToDecryptEventEnd(span: Span): Unit =
    tracer.scopeManager().activate(span, true).close()