AWS | X-Ray propagator

The X-Ray propagator implements AWS X-Ray Trace Header propagation protocol. The propagator utilizes X-Amzn-Trace-Id header to extract and inject tracing details. An example of the AWS X-Ray Tracing Header:

X-Amzn-Trace-Id: Root=1-5759e988-bd862e3fe1be46a994272793;Parent=53995c3f42cd8ad8;Sampled=1

Getting Started

Add settings to the build.sbt:

libraryDependencies ++= Seq(
  "org.typelevel" %%% "otel4s-sdk" % "0.14.0", // <1>
  "org.typelevel" %%% "otel4s-sdk-exporter" % "0.14.0", // <2>
  "org.typelevel" %%% "otel4s-sdk-contrib-aws-xray-propagator" % "0.14.0" // <3>
)

Add directives to the *.scala file:

//> using dep "org.typelevel::otel4s-sdk::0.14.0" // <1>
//> using dep "org.typelevel::otel4s-sdk-exporter::0.14.0" // <2>
//> using dep "org.typelevel::otel4s-sdk-contrib-aws-xray-propagator::0.14.0" // <3>
  1. Add the otel4s-sdk library
  2. Add the otel4s-sdk-exporter library. Without the exporter, the application will crash
  3. Add the otel4s-sdk-contrib-aws-xray-propagator library

Then autoconfigure the SDK:

OpenTelemetrySdk.autoConfigured configures both MeterProvider and TracerProvider:

import cats.effect.{IO, IOApp}
import org.typelevel.otel4s.metrics.MeterProvider
import org.typelevel.otel4s.sdk.OpenTelemetrySdk
import org.typelevel.otel4s.sdk.contrib.aws.context.propagation._
import org.typelevel.otel4s.sdk.exporter.otlp.autoconfigure.OtlpExportersAutoConfigure
import org.typelevel.otel4s.trace.TracerProvider

object TelemetryApp extends IOApp.Simple {

  def run: IO[Unit] =
    OpenTelemetrySdk
      .autoConfigured[IO]( 
        // register OTLP exporters configurer
        _.addExportersConfigurer(OtlpExportersAutoConfigure[IO])
        // add AWS X-Ray Propagator
         .addTracerProviderCustomizer((b, _) => 
           b.addTextMapPropagators(AwsXRayPropagator())
         )
      )
      .use { autoConfigured =>
        val sdk = autoConfigured.sdk
        program(sdk.meterProvider, sdk.tracerProvider)
      }

  def program(
      meterProvider: MeterProvider[IO], 
      tracerProvider: TracerProvider[IO]
  ): IO[Unit] =
    ???
}

SdkTraces configures only TracerProvider: 

import cats.effect.{IO, IOApp}
import org.typelevel.otel4s.sdk.contrib.aws.context.propagation._
import org.typelevel.otel4s.sdk.exporter.otlp.trace.autoconfigure.OtlpSpanExporterAutoConfigure
import org.typelevel.otel4s.sdk.trace.SdkTraces
import org.typelevel.otel4s.trace.TracerProvider

object TelemetryApp extends IOApp.Simple {

  def run: IO[Unit] =
    SdkTraces
      .autoConfigured[IO]( 
        // register OTLP exporters configurer
        _.addExporterConfigurer(OtlpSpanExporterAutoConfigure[IO])
        // add AWS X-Ray Propagator
         .addTracerProviderCustomizer((b, _) => 
           b.addTextMapPropagators(AwsXRayPropagator())
         )
      )
      .use { autoConfigured =>
        program(autoConfigured.tracerProvider)
      }

  def program(
      tracerProvider: TracerProvider[IO]
  ): IO[Unit] =
    ???
}

AWS Lambda

AWS Lambda can utilize _X_AMZN_TRACE_ID environment variable or com.amazonaws.xray.traceHeader system property to set the X-Ray tracing header.

Use AwsXRayLambdaPropagator in such a case.

OpenTelemetrySdk.autoConfigured configures both MeterProvider and TracerProvider:

import cats.effect.{IO, IOApp}
import org.typelevel.otel4s.metrics.MeterProvider
import org.typelevel.otel4s.sdk.OpenTelemetrySdk
import org.typelevel.otel4s.sdk.contrib.aws.context.propagation._
import org.typelevel.otel4s.sdk.exporter.otlp.autoconfigure.OtlpExportersAutoConfigure
import org.typelevel.otel4s.trace.TracerProvider

object TelemetryApp extends IOApp.Simple {

  def run: IO[Unit] =
    OpenTelemetrySdk
      .autoConfigured[IO]( 
        // register OTLP exporters configurer
        _.addExportersConfigurer(OtlpExportersAutoConfigure[IO])
        // add AWS X-Ray Lambda Propagator
         .addTracerProviderCustomizer((b, _) => 
           b.addTextMapPropagators(AwsXRayLambdaPropagator())
         )
      )
      .use { autoConfigured =>
        val sdk = autoConfigured.sdk
        program(sdk.meterProvider, sdk.tracerProvider)
      }

  def program(
      meterProvider: MeterProvider[IO], 
      tracerProvider: TracerProvider[IO]
  ): IO[Unit] =
    ???
}

SdkTraces configures only TracerProvider:

import cats.effect.{IO, IOApp}
import org.typelevel.otel4s.sdk.contrib.aws.context.propagation._
import org.typelevel.otel4s.sdk.exporter.otlp.trace.autoconfigure.OtlpSpanExporterAutoConfigure
import org.typelevel.otel4s.sdk.trace.SdkTraces
import org.typelevel.otel4s.trace.TracerProvider

object TelemetryApp extends IOApp.Simple {

  def run: IO[Unit] =
    SdkTraces
      .autoConfigured[IO]( 
        // register OTLP exporters configurer
        _.addExporterConfigurer(OtlpSpanExporterAutoConfigure[IO])
        // add AWS X-Ray Lambda Propagator
         .addTracerProviderCustomizer((b, _) => 
           b.addTextMapPropagators(AwsXRayLambdaPropagator())
         )
      )
      .use { autoConfigured =>
        program(autoConfigured.tracerProvider)
      }

  def program(
      tracerProvider: TracerProvider[IO]
  ): IO[Unit] =
    ???
}