Migrate SLF4J Simple test setup to a convention plugin

build-logic/conventions/src/main/kotlin/dd-trace-java.conventions.testing.slf4j-simple.gradle.kts

@@ -0,0 +1,29 @@
+import org.gradle.api.artifacts.VersionCatalogsExtension
+import org.gradle.api.tasks.testing.Test
+import org.gradle.kotlin.dsl.getByType
+
+val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")
+val slf4jVersion = libs.findVersion("slf4j").get().requiredVersion
+val slf4jSimple = "org.slf4j:slf4j-simple:$slf4jVersion"
+val projectDependencies = dependencies
+
+configurations.configureEach {
+  if (name.contains("test", ignoreCase = true)) {
+    if (name.endsWith("runtimeClasspath", ignoreCase = true)) {
+      exclude(group = "ch.qos.logback")
+    }
+
+    if (name.endsWith("runtimeOnly", ignoreCase = true)) {
+      projectDependencies.add(name, slf4jSimple)
+    }
+  }
+}
+
+tasks.withType<Test>().configureEach {
+  jvmArgs(
+    "-Dorg.slf4j.simpleLogger.defaultLogLevel=debug",
+    "-Dorg.slf4j.simpleLogger.showThreadName=true",
+    "-Dorg.slf4j.simpleLogger.showDateTime=true",
+    "-Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss.SSS",
+  )
+}

dd-java-agent/instrumentation/java/java-concurrent/java-concurrent-21.0/build.gradle

@@ -1,11 +1,10 @@
 plugins {
   id 'idea'
   id 'dd-trace-java.module.instrumentation'
+  // Use slf4j-simple as default; logback has a high chance of getting stuck in a deadlock on CI.
+  id 'dd-trace-java.conventions.testing.slf4j-simple'
 }
 
-// Use slf4j-simple as default; logback has a high chance of getting stuck in a deadlock on CI.
-apply from: "$rootDir/gradle/slf4j-simple.gradle"
-
 testJvmConstraints {
   minJavaVersion = JavaVersion.VERSION_21
 }

dd-java-agent/instrumentation/java/java-concurrent/java-concurrent-25.0/build.gradle

@@ -1,11 +1,10 @@
 plugins {
   id 'idea'
   id 'dd-trace-java.module.instrumentation'
+  // Use slf4j-simple as default; logback has a high chance of getting stuck in a deadlock on CI.
+  id 'dd-trace-java.conventions.testing.slf4j-simple'
 }
 
-// Use slf4j-simple as default; logback has a high chance of getting stuck in a deadlock on CI.
-apply from: "$rootDir/gradle/slf4j-simple.gradle"
-
 muzzle {
   pass {
     coreJdk('25')

dd-java-agent/instrumentation/java/java-lang/java-lang-21.0/build.gradle

@@ -1,11 +1,10 @@
 plugins {
   id 'idea'
   id 'dd-trace-java.module.instrumentation'
+  // Use slf4j-simple as default; logback has a high chance of getting stuck in a deadlock on CI.
+  id 'dd-trace-java.conventions.testing.slf4j-simple'
 }
 
-// Use slf4j-simple as default; logback has a high chance of getting stuck in a deadlock on CI.
-apply from: "$rootDir/gradle/slf4j-simple.gradle"
-
 testJvmConstraints {
   minJavaVersion = JavaVersion.VERSION_21
 }

dd-java-agent/instrumentation/java/java-lang/java-lang-22.0/build.gradle

@@ -1,6 +1,7 @@
 plugins {
   id 'idea'
   id 'dd-trace-java.module.instrumentation'
+  id 'dd-trace-java.conventions.testing.slf4j-simple'
 }
 
 muzzle {
@@ -9,8 +10,6 @@ muzzle {
   }
 }
 
-apply from: "$rootDir/gradle/slf4j-simple.gradle"
-
 tracerJava {
   addSourceSetFor(JavaVersion.VERSION_25)
 }