chore: simplify implementation (no C3)

Author: diegomarquezp

gax-java/gax/src/main/java/com/google/api/gax/rpc/StubSettings.java

@@ -46,14 +46,9 @@
 import com.google.api.gax.core.NoCredentialsProvider;
 import com.google.api.gax.tracing.ApiTracerFactory;
 import com.google.api.gax.tracing.BaseApiTracerFactory;
-import com.google.api.gax.tracing.CompositeApiTracerFactory;
-import com.google.api.gax.tracing.OpenTelemetryTracingRecorder;
-import com.google.api.gax.tracing.TracingTracerFactory;
-import com.google.api.gax.tracing.TracingUtils;
 import com.google.auth.oauth2.QuotaProjectIdProvider;
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
-import io.opentelemetry.api.GlobalOpenTelemetry;
 import java.io.IOException;
 import java.util.concurrent.Executor;
 import javax.annotation.Nonnull;
@@ -109,26 +104,13 @@ protected StubSettings(Builder builder) {
     this.quotaProjectId = builder.quotaProjectId;
     this.streamWatchdogProvider = builder.streamWatchdogProvider;
     this.streamWatchdogCheckInterval = builder.streamWatchdogCheckInterval;
-    this.tracerFactory = autoConfigureTracerFactory(builder.tracerFactory);
+    this.tracerFactory = builder.tracerFactory;
     this.deprecatedExecutorProviderSet = builder.deprecatedExecutorProviderSet;
     this.gdchApiAudience = builder.gdchApiAudience;
     this.endpointContext = buildEndpointContext(builder);
     this.apiKey = builder.apiKey;
   }
 
-  private ApiTracerFactory autoConfigureTracerFactory(ApiTracerFactory factory) {
-    if (TracingUtils.isTracingEnabled()) {
-      ApiTracerFactory tracingFactory =
-          new TracingTracerFactory(
-              new OpenTelemetryTracingRecorder(GlobalOpenTelemetry.get(), getServiceName()));
-      if (factory instanceof BaseApiTracerFactory) {
-        return tracingFactory;
-      }
-      return CompositeApiTracerFactory.of(factory, tracingFactory);
-    }
-    return factory;
-  }
-
   /**
    * Attempt to build the EndpointContext from the Builder based on all the user configurations
    * passed in.

gax-java/gax/src/main/java/com/google/api/gax/tracing/CompositeApiTracer.java

@@ -67,9 +67,6 @@ public TracingTracerFactory(TracingRecorder tracingRecorder, Map<String, String>
 
   @Override
   public ApiTracer newTracer(ApiTracer parent, SpanName spanName, OperationType operationType) {
-    if (!TracingUtils.isTracingEnabled()) {
-      return BaseApiTracer.getInstance();
-    }
     TracingTracer tracingTracer = new TracingTracer(tracingRecorder);
     attributes.forEach(tracingTracer::addAttributes);
     return tracingTracer;