Internal instrumentations should always be enabled by default (#3257)

instrumentation/internal/internal-class-loader/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/internal/classloader/ClassLoaderInstrumentationModule.java

@@ -18,6 +18,12 @@ public class ClassLoaderInstrumentationModule extends InstrumentationModule {
     super("internal-class-loader");
   }
 
+  @Override
+  public boolean defaultEnabled() {
+    // internal instrumentations are always enabled by default
+    return true;
+  }
+
   @Override
   public boolean isHelperClass(String className) {
     return className.equals("io.opentelemetry.javaagent.tooling.Constants");

instrumentation/internal/internal-eclipse-osgi-3.6/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/internal/osgi/EclipseOsgiInstrumentationModule.java

@@ -18,6 +18,12 @@ public class EclipseOsgiInstrumentationModule extends InstrumentationModule {
     super("internal-eclipse-osgi");
   }
 
+  @Override
+  public boolean defaultEnabled() {
+    // internal instrumentations are always enabled by default
+    return true;
+  }
+
   @Override
   public List<TypeInstrumentation> typeInstrumentations() {
     return singletonList(new EclipseOsgiInstrumentation());

instrumentation/internal/internal-proxy/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/internal/proxy/ProxyInstrumentationModule.java

@@ -18,6 +18,12 @@ public class ProxyInstrumentationModule extends InstrumentationModule {
     super("internal-proxy");
   }
 
+  @Override
+  public boolean defaultEnabled() {
+    // internal instrumentations are always enabled by default
+    return true;
+  }
+
   @Override
   public List<TypeInstrumentation> typeInstrumentations() {
     return singletonList(new ProxyInstrumentation());

instrumentation/internal/internal-url-class-loader/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/internal/urlclassloader/UrlClassLoaderInstrumentationModule.java

@@ -18,6 +18,12 @@ public class UrlClassLoaderInstrumentationModule extends InstrumentationModule {
     super("internal-url-class-loader");
   }
 
+  @Override
+  public boolean defaultEnabled() {
+    // internal instrumentations are always enabled by default
+    return true;
+  }
+
   @Override
   public List<TypeInstrumentation> typeInstrumentations() {
     return singletonList(new UrlClassLoaderInstrumentation());