Demosntrate declarative config 0.3 with otel java agent

javaagent/Dockerfile

@@ -2,5 +2,6 @@ FROM eclipse-temurin:11-jre
 
 ADD build/libs/app.jar /app.jar
 ADD build/agent/opentelemetry-javaagent.jar /opentelemetry-javaagent.jar
+ADD build/agent/opentelemetry-javaagent-extension.jar /opentelemetry-javaagent-extension.jar
 
-ENTRYPOINT java -jar -javaagent:/opentelemetry-javaagent.jar /app.jar
+ENTRYPOINT java -jar -javaagent:/opentelemetry-javaagent.jar -Dotel.javaagent.extensions=/opentelemetry-javaagent-extension.jar /app.jar

javaagent/README.md

@@ -47,12 +47,15 @@ Watch for spans, metrics, and logs in the collector log output
 
 ## File Configuration
 
-By default, this example uses the [environment variable configuration schema](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md) to configure the SDK. However, it also includes [sdk-config.yaml](./sdk-config.yaml) which demonstrates how the file configuration scheme can be used instead. `sdk-config.yaml` demonstrates view configuration to disable a metric, something which is not available in the environment variable configuration scheme.
+By default, this example uses the [environment variable configuration schema](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md) to configure the SDK. However, it also includes [sdk-migration-config.yaml](./sdk-migration-config.yaml) which demonstrates how the file configuration scheme can be used instead. `sdk-migration-config.yaml` extends the [opentelemetry-configuration sdk-migration-config.yaml](https://github.com/open-telemetry/opentelemetry-configuration/blob/v0.3.0/examples/sdk-migration-config.yaml) template, demonstrating:
+
+- Configuration of instrumentation (see `.instrumentation.java`) 
+- Configuration of [rule based routing sampler](https://github.com/open-telemetry/opentelemetry-java-contrib/tree/main/samplers) (see `.tracer_provider.sampler`)
 
 To use file configuration instead of the environment variable scheme, add the following before starting the application and collector:
 
 ```shell
-export OTEL_CONFIG_FILE=/sdk-config.yaml
+export OTEL_EXPERIMENTAL_CONFIG_FILE=/sdk-migration-config.yaml
 ```
 
-Note that toggling file configuration causes the environment variable configuration scheme to be ignored completely. However, there is support for environment variable substitution within configuration files.
+Note besides the environment variables referenced in `sdk-migration-config.yaml` using [substitution syntax](https://opentelemetry.io/docs/specs/otel/configuration/data-model/#environment-variable-substitution), environment variables are ignored.

javaagent/build.gradle.kts

@@ -16,15 +16,18 @@ java {
 }
 
 val agent = configurations.create("agent")
+val extension = configurations.create("extension")
 
 dependencies {
     implementation(platform(SpringBootPlugin.BOM_COORDINATES))
     implementation("io.opentelemetry:opentelemetry-api")
 
     //spring modules
     implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-actuator")
 
     agent("io.opentelemetry.javaagent:opentelemetry-javaagent:2.9.0")
+    extension("io.opentelemetry.contrib:opentelemetry-samplers:1.40.0-alpha")
 }
 
 val copyAgent = tasks.register<Copy>("copyAgent") {
@@ -33,9 +36,19 @@ val copyAgent = tasks.register<Copy>("copyAgent") {
     rename("opentelemetry-javaagent-.*\\.jar", "opentelemetry-javaagent.jar")
 }
 
+val copyExtension = tasks.register<Copy>("copyExtension") {
+    from(extension.files) {
+        include("opentelemetry-samplers-*.jar")
+        exclude("*sources.jar")
+        exclude("*javadoc.jar")
+    }
+    into(layout.buildDirectory.dir("agent"))
+    rename(".*\\.jar", "opentelemetry-javaagent-extension.jar")
+}
 
 tasks.named<BootJar>("bootJar") {
     dependsOn(copyAgent)
+    dependsOn(copyExtension)
 
     archiveFileName = "app.jar"
 }

javaagent/docker-compose.yml

@@ -4,16 +4,18 @@ services:
     build: ./
     environment:
       OTEL_SERVICE_NAME: "agent-example-app"
-      OTEL_EXPORTER_OTLP_ENDPOINT: "http://collector:4318"
+      OTEL_EXPORTER_OTLP_TRACES_ENDPOINT: "http://collector:4318/v1/traces"
+      OTEL_EXPORTER_OTLP_METRICS_ENDPOINT: "http://collector:4318/v1/metrics"
+      OTEL_EXPORTER_OTLP_LOGS_ENDPOINT: "http://collector:4318/v1/logs"
       # Logs are disabled by default
       OTEL_LOGS_EXPORTER: "otlp"
       # Optional specify file configuration instead of using environment variable scheme
-      # To use, call "export OTEL_CONFIG_FILE=/sdk-config.yaml" before calling docker compose up
-      OTEL_CONFIG_FILE:
+      # To use, call "export OTEL_EXPERIMENTAL_CONFIG_FILE=/sdk-migration-config.yaml" before calling docker compose up
+      OTEL_EXPERIMENTAL_CONFIG_FILE: /sdk-migration-config.yaml
     ports:
       - "8080:8080"
     volumes:
-      - ./sdk-config.yaml:/sdk-config.yaml
+      - ./sdk-migration-config.yaml:/sdk-migration-config.yaml
     depends_on:
       - collector
   collector: