make agent tracer available for spring starter

Author: zeitlinger

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/internal/instrumentation/threaddetails/AgentTracerProviderConfigurer.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.internal.instrumentation.threaddetails;
+
+import io.opentelemetry.instrumentation.spring.autoconfigure.internal.ConditionalOnEnabledInstrumentation;
+import io.opentelemetry.instrumentation.tracer.AddThreadDetailsSpanProcessor;
+import io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizerProvider;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * This class is internal and is hence not for public use. Its APIs are unstable and can change at
+ * any time.
+ */
+@ConditionalOnEnabledInstrumentation(module = "thread-details")
+@Configuration
+@SuppressWarnings("OtelPrivateConstructorForUtilityClass")
+public class AgentTracerProviderConfigurer {
+
+  @Bean
+  public AutoConfigurationCustomizerProvider otelCustomizer() {
+    return p ->
+        p.addTracerProviderCustomizer(
+            (builder, config) -> {
+              builder.addSpanProcessor(new AddThreadDetailsSpanProcessor());
+              return builder;
+            });
+  }
+}

sdk-autoconfigure-support/src/main/java/io/opentelemetry/instrumentation/tracer/AgentTracerProviderConfigurer.java renamed to javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/AgentTracerProviderConfigurer.java

@@ -3,21 +3,23 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.instrumentation.tracer;
+package io.opentelemetry.javaagent.tooling;
 
 import static io.opentelemetry.javaagent.tooling.AgentInstaller.JAVAAGENT_ENABLED_CONFIG;
 import static java.util.Collections.emptyList;
 
 import com.google.auto.service.AutoService;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import io.opentelemetry.exporter.logging.LoggingSpanExporter;
+import io.opentelemetry.instrumentation.tracer.AddThreadDetailsSpanProcessor;
 import io.opentelemetry.javaagent.tooling.config.AgentConfig;
 import io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizer;
 import io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizerProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
 import io.opentelemetry.sdk.trace.SdkTracerProviderBuilder;
 import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
 
+@AutoService(AutoConfigurationCustomizerProvider.class)
 public class AgentTracerProviderConfigurer implements AutoConfigurationCustomizerProvider {
   private static final String ADD_THREAD_DETAILS = "otel.javaagent.add-thread-details";
 
@@ -30,9 +32,7 @@ public void customize(AutoConfigurationCustomizer autoConfigurationCustomizer) {
   @CanIgnoreReturnValue
   private static SdkTracerProviderBuilder configure(
       SdkTracerProviderBuilder sdkTracerProviderBuilder, ConfigProperties config) {
-    // Spring starter uses "otel.sdk.disabled" to disable the SDK, but this check is enabled
-    // by default - so it shouldn't impact the Spring starter.
-    if (!config.getBoolean("otel.javaagent.enabled", true)) {
+    if (!config.getBoolean(JAVAAGENT_ENABLED_CONFIG, true)) {
       return sdkTracerProviderBuilder;
     }
 

sdk-autoconfigure-support/src/main/resources/META-INF/services/io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizerProvider

@@ -1,2 +1 @@
 io.opentelemetry.instrumentation.resources.ResourceProviderPropertiesCustomizer
-io.opentelemetry.instrumentation.tracer.AgentTracerProviderConfigurer