build.sbt

libraryDependencies ++= Seq(
  "com.datadoghq" % "dd-trace-api" % "0.104.0",
  "io.opentracing" % "opentracing-util" % "0.33.0",
)

Tracing.scala

package util

import io.opentracing.util.GlobalTracer
import datadog.trace.api.DDTags

object Tracing {

  private val tracer = GlobalTracer.get
  private val serviceName = sys.env.getOrElse("DD_SERVICE", "missing DD_SERVICE env var")

  def trace[T](name: String)(tags: (String, String)*)(f: => T) = {
    val builder = tracer.buildSpan(name)
      .withTag(DDTags.SERVICE_NAME, serviceName)
      .withTag(DDTags.RESOURCE_NAME, name)

    val taggedBuilder = tags.foldLeft(builder) { case (builder, (key, value)) =>
      builder.withTag(key, value)
    }

    val span = taggedBuilder.start()
    val scope = tracer.activateSpan(span)

    try {
      f

      scope.close()
      span.finish()
    } catch {
      case e: Throwable =>
        span.setTag("error", e.getMessage)

        scope.close()
        span.finish()
        throw e
    }
  }

}